| Tuesday | Jan 1 | New Year's Day | National holiday | |
| Sunday | Jan 6 | Epiphany | Christian | |
| Monday | Jan 7 | Orthodox Christmas Day | Orthodox | |
| Monday | Jan 7 | International Programmers' Day | Worldwide observance | |
| Sunday | Jan 13 | Stephen Foster Memorial Day | Observance | |
| Monday | Jan 14 | Orthodox New Year | Orthodox | |
| Friday | Jan 18 | Lee Jackson Day | State holiday | Virginia |
| Saturday | Jan 19 | Robert E Lee's Birthday | State holiday | Florida |
| Saturday | Jan 19 | Confederate Memorial Day | State holiday | Texas |
| Sunday | Jan 20 | Inauguration Day | State holiday | DC, LA, MD, VA |
| Monday | Jan 21 | Idaho Human Rights Day | State holiday | Idaho |
| Monday | Jan 21 | Robert E Lee's Birthday | State holiday | AL, AR, GA, MS |
| Monday | Jan 21 | Civil Rights Day | State holiday | Arizona, New Hampshire |
| Monday | Jan 21 | Martin Luther King Day | National holiday | |
| Thursday | Jan 24 | Prophet's Birthday | Muslim | |
| Saturday | Jan 26 | Tu B'Shevat (Arbor Day) | Jewish holiday | |
| Sunday | Jan 27 | e-Day | Worldwide observance | |
| Sunday | Jan 27 | International Day of Commemoration in Memory of the Victims of the Holocaust | United Nations observance | |
| Tuesday | Jan 29 | Kansas Day | Observance | |
| Friday | Feb 1 | National Freedom Day | Observance | |
| Saturday | Feb 2 | Groundhog Day | Observance | |
| Monday | Feb 4 | World Cancer Day | United Nations observance | |
| Thursday | Feb 7 | e-Day | Worldwide observance | |
| Sunday | Feb 10 | Chinese New Year | Observance | |
| Tuesday | Feb 12 | Shrove Tuesday/Mardi Gras | State holiday | Alabama, Louisiana |
| Tuesday | Feb 12 | Lincoln's Birthday | State holiday | CT, IL, MO, NJ, NY |
| Tuesday | Feb 12 | Shrove Tuesday/Mardi Gras | Observance | |
| Wednesday | Feb 13 | Ash Wednesday | Christian | |
| Thursday | Feb 14 | Valentine's Day | Observance | |
| Monday | Feb 18 | Presidents' Day (Washington's Birthday) | National holiday | |
| Monday | Feb 18 | Daisy Gatson Bates Day | State holiday | Arkansas |
| Wednesday | Feb 20 | World Day of Social Justice | United Nations observance | |
| Thursday | Feb 21 | International Mother Language Day | United Nations observance | |
| Sunday | Feb 24 | Purim | Jewish holiday | |
| Friday | Mar 1 | Read Across America Day | Observance | |
| Friday | Mar 1 | Self-injury Awareness Day | Worldwide observance | |
| Friday | Mar 1 | St. David's Day | Observance | |
| Saturday | Mar 2 | Texas Independence Day | State holiday | Texas |
| Monday | Mar 4 | Casimir Pulaski Day | State holiday | Illinois |
| Tuesday | Mar 5 | Town Meeting Day Vermont | State holiday | |
| Friday | Mar 8 | International Women's Day | United Nations observance | |
| Sunday | Mar 10 | Daylight Saving Time starts | Clock change/Daylight Saving Time | |
| Thursday | Mar 14 | World Kidney Day | Worldwide observance | |
| Thursday | Mar 14 | Pi Day | Worldwide observance | |
| Sunday | Mar 17 | Evacuation Day | State holiday | Massachusetts |
| Sunday | Mar 17 | St. Patrick's Day | Observance | |
| Monday | Mar 18 | Evacuation Day observed | State holiday | Massachusetts |
| Wednesday | Mar 20 | March equinox | Season | |
| Wednesday | Mar 20 | International Day of Happiness | United Nations observance | |
| Thursday | Mar 21 | World Poetry Day | United Nations observance | |
| Thursday | Mar 21 | World Down Syndrome Day | United Nations observance | |
| Thursday | Mar 21 | International Day for the Elimination of Racial Discrimination | United Nations observance | |
| Thursday | Mar 21 | International Day of Nowruz | United Nations observance | |
| Friday | Mar 22 | World Water Day | United Nations observance | |
| Saturday | Mar 23 | World Meteorological Day | United Nations observance | |
| Saturday | Mar 23 | Earth Hour | Worldwide observance | |
| Sunday | Mar 24 | International Day for the Right to the Truth concerning Gross Human Rights Violations and for the Dignity of Victims | United Nations observance | |
| Sunday | Mar 24 | World Tuberculosis Day | United Nations observance | |
| Sunday | Mar 24 | Palm Sunday | Christian | |
| Monday | Mar 25 | International Day of Solidarity with Detained and Missing Staff Members | United Nations observance | |
| Monday | Mar 25 | Maryland Day | State holiday | Maryland |
| Monday | Mar 25 | International Day of Remembrance of Slavery Victims and the Transatlantic Slave Trade | United Nations observance | |
| Monday | Mar 25 | Seward's Day | State holiday | Alaska |
| Tuesday | Mar 26 | First day of Passover | Jewish holiday | |
| Tuesday | Mar 26 | Prince Jonah Kuhio Kalanianaole Day | State holiday | Hawaii |
| Thursday | Mar 28 | Maundy Thursday | Christian | |
| Friday | Mar 29 | Good Friday | State holiday | 14 states |
| Saturday | Mar 30 | Holy Saturday | Christian | |
| Sunday | Mar 31 | César Chávez Day | State holiday | CA, CO*, TX* |
| Sunday | Mar 31 | Easter Sunday | Observance, Christian | |
| Monday | Apr 1 | Easter Monday | Christian | |
| Monday | Apr 1 | April Fool's Day | Worldwide observance | |
| Monday | Apr 1 | César Chávez Day observed | State holiday | California |
| Tuesday | Apr 2 | Pascua Florida Day | State holiday | Florida |
| Tuesday | Apr 2 | Last day of Passover | Jewish holiday | |
| Tuesday | Apr 2 | World Autism Awareness Day | United Nations observance | |
| Thursday | Apr 4 | United Nations' Mine Awareness Day | United Nations observance | |
| Saturday | Apr 6 | National Tartan Day | Observance | |
| Sunday | Apr 7 | United Nations' World Health Day | United Nations observance | |
| Sunday | Apr 7 | Day of Remembrance of the Victims of the Rwanda Genocide | United Nations observance | |
| Monday | Apr 8 | Yom HaShoah | Jewish holiday | |
| Friday | Apr 12 | International Day of Human Space Flight | United Nations observance | |
| Monday | Apr 15 | Tax Day | Observance | |
| Monday | Apr 15 | Patriot's Day | State holiday | Maine, Massachusetts |
| Monday | Apr 15 | Father Damien Day | Local observance | Hawaii |
| Tuesday | Apr 16 | Yom HaAtzmaut | Jewish holiday | |
| Tuesday | Apr 16 | Emancipation Day | State holiday | District of Columbia |
| Sunday | Apr 21 | San Jacinto Day | State holiday | Texas |
| Monday | Apr 22 | Confederate Memorial Day | State holiday | AL, FL, GA |
| Monday | Apr 22 | Earth Day | Worldwide observance | |
| Monday | Apr 22 | Oklahoma Day | Local observance | Oklahoma |
| Tuesday | Apr 23 | World Book and Copyright Day | United Nations observance | |
| Wednesday | Apr 24 | Administrative Professionals Day | Observance | |
| Thursday | Apr 25 | World Malaria Day | United Nations observance | |
| Friday | Apr 26 | Arbor Day | State holiday | Nebraska |
| Friday | Apr 26 | World Intellectual Property Day | United Nations observance | |
| Friday | Apr 26 | Global Youth Service Day | Worldwide observance | |
| Sunday | Apr 28 | Lag B'Omer | Jewish holiday | |
| Sunday | Apr 28 | World Day for Safety and Health at Work | United Nations observance | |
| Monday | Apr 29 | Day of Remembrance for all Victims of Chemical Warfare | United Nations observance | |
| Monday | Apr 29 | Confederate Memorial Day | State holiday | Mississippi |
| Tuesday | Apr 30 | International Jazz Day | United Nations observance | |
| Wednesday | May 1 | Law Day | Observance | |
| Wednesday | May 1 | Loyalty Day | Observance | |
| Thursday | May 2 | National Day of Prayer | Observance | |
| Friday | May 3 | Orthodox Good Friday | Orthodox | |
| Friday | May 3 | World Press Freedom Day | United Nations observance | |
| Saturday | May 4 | Rhode Island Independence Day | State holiday | Rhode Island |
| Saturday | May 4 | Orthodox Holy Saturday | Orthodox | |
| Sunday | May 5 | Orthodox Easter | Orthodox | |
| Sunday | May 5 | Cinco de Mayo | Observance | |
| Monday | May 6 | Orthodox Easter Monday | Orthodox | |
| Monday | May 6 | National Nurses Day | Observance | |
| Wednesday | May 8 | Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War | United Nations observance | |
| Wednesday | May 8 | Truman Day | State holiday | Missouri |
| Thursday | May 9 | Ascension Day | Christian | |
| Friday | May 10 | Confederate Memorial Day | State holiday | North Carolina, South Carolina |
| Saturday | May 11 | World Migratory Bird Day | United Nations observance | |
| Sunday | May 12 | Mother's Day | Observance | |
| Wednesday | May 15 | Peace Officers Memorial Day | Observance | |
| Wednesday | May 15 | Shavuot | Jewish holiday | |
| Wednesday | May 15 | International Day of Families | United Nations observance | |
| Friday | May 17 | National Defense Transportation Day | Observance | |
| Friday | May 17 | World Information Society Day | United Nations observance | |
| Saturday | May 18 | Armed Forces Day | Observance | |
| Sunday | May 19 | Pentecost | Christian | |
| Monday | May 20 | Whit Monday | Christian | |
| Monday | May 20 | World Autoimmune Arthritis Day | Worldwide observance | |
| Tuesday | May 21 | World Day for Cultural Diversity for Dialogue and Development | United Nations observance | |
| Wednesday | May 22 | National Maritime Day | Observance | |
| Wednesday | May 22 | Emergency Medical Services for Children Day | Observance | |
| Wednesday | May 22 | International Day for Biological Diversity | United Nations observance | |
| Wednesday | May 22 | Harvey Milk Day | Observance | California |
| Saturday | May 25 | Towel Day | Worldwide observance | |
| Saturday | May 25 | African Liberation Day | Worldwide observance | |
| Saturday | May 25 | National Missing Children's Day | Observance | |
| Sunday | May 26 | Trinity Sunday | Christian | |
| Monday | May 27 | Jefferson Davis Birthday | Observance | Mississippi |
| Monday | May 27 | Memorial Day | National holiday | |
| Wednesday | May 29 | International Day of United Nations Peacekeepers | United Nations observance | |
| Thursday | May 30 | Corpus Christi | Christian | |
| Friday | May 31 | World No Tobacco Day | United Nations observance | |
| Saturday | Jun 1 | Statehood Day | State holiday | Kentucky, Tennessee |
| Monday | Jun 3 | Jefferson Davis Birthday | State holiday | Alabama |
| Monday | Jun 3 | Jefferson Davis Birthday | Observance | Florida |
| Tuesday | Jun 4 | International Day of Innocent Children Victims of Aggression | United Nations observance | |
| Wednesday | Jun 5 | World Environment Day | United Nations observance | |
| Thursday | Jun 6 | Isra and Mi'raj | Muslim | |
| Thursday | Jun 6 | D-Day | Observance | |
| Saturday | Jun 8 | World Oceans Day | United Nations observance | |
| Tuesday | Jun 11 | Kamehameha Day | State holiday | Hawaii |
| Wednesday | Jun 12 | World Day Against Child Labour | United Nations observance | |
| Friday | Jun 14 | World Blood Donor Day | United Nations observance | |
| Friday | Jun 14 | Flag Day | Observance | |
| Saturday | Jun 15 | World Elder Abuse Awareness Day | United Nations observance | |
| Sunday | Jun 16 | Father's Day | Observance | |
| Monday | Jun 17 | Bunker Hill Day | State holiday | Massachusetts |
| Monday | Jun 17 | World Day to Combat Desertification and Drought | United Nations observance | |
| Wednesday | Jun 19 | Juneteenth | Local observance | All except AL, American Samoa, GA, HI, MD, ME, MP, MS, MT, ND, NH, NV, PA, RI, SD, UT, Virgin Islands, Wake Island |
| Thursday | Jun 20 | West Virginia Day | State holiday | West Virginia |
| Thursday | Jun 20 | World Refugee Day | United Nations observance | |
| Friday | Jun 21 | June Solstice | Season | |
| Sunday | Jun 23 | Public Service Day | United Nations observance | |
| Sunday | Jun 23 | International Widows' Day | United Nations observance | |
| Tuesday | Jun 25 | Day of the Seafarer | United Nations observance | |
| Wednesday | Jun 26 | International Day in Support of Victims of Torture | United Nations observance | |
| Wednesday | Jun 26 | International Day Against Drug Abuse and Illicit Trafficking | United Nations observance | |
| Thursday | Jul 4 | Independence Day | National holiday | |
| Saturday | Jul 6 | International Day of Cooperatives | United Nations observance | |
| Tuesday | Jul 9 | Ramadan begins | Muslim | |
| Thursday | Jul 11 | World Population Day | United Nations observance | |
| Tuesday | Jul 16 | Tisha B'Av | Jewish holiday | |
| Thursday | Jul 18 | Nelson Mandela Day | United Nations observance | |
| Monday | Jul 22 | Pi Approximation Day | Worldwide observance | |
| Wednesday | Jul 24 | Pioneer Day | State holiday | Utah |
| Sunday | Jul 28 | World Hepatitis Day | United Nations observance | |
| Sunday | Jul 28 | Parents' Day | Observance | |
| Tuesday | Jul 30 | International Day of Friendship | United Nations observance | |
| Saturday | Aug 3 | Laylat al-Qadr | Muslim | |
| Thursday | Aug 8 | Eid-al-Fitr | Muslim | |
| Friday | Aug 9 | International Day of the World's Indigenous People | United Nations observance | |
| Monday | Aug 12 | International Youth Day | United Nations observance | |
| Monday | Aug 12 | Victory Day | State holiday | Rhode Island |
| Thursday | Aug 15 | Assumption of Mary | Christian | |
| Friday | Aug 16 | Statehood Day in Hawaii | State holiday | Hawaii |
| Friday | Aug 16 | Bennington Battle Day | State holiday | Vermont |
| Monday | Aug 19 | World Humanitarian Day | United Nations observance | |
| Monday | Aug 19 | National Aviation Day | Observance | |
| Wednesday | Aug 21 | Senior Citizens Day | Observance | |
| Friday | Aug 23 | International Day for the Remembrance of the Slave Trade and its Abolition | United Nations observance | |
| Tuesday | Aug 27 | Lyndon Baines Johnson Day | State holiday | Texas |
| Thursday | Aug 29 | International Day against Nuclear Tests | United Nations observance | |
| Friday | Aug 30 | International Day of the Victims of Enforced Disappearances | United Nations observance | |
| Monday | Sep 2 | Labor Day | National holiday | |
| Thursday | Sep 5 | Rosh Hashana | Jewish holiday | |
| Saturday | Sep 7 | Carl Garner Federal Lands Cleanup Day | Observance | |
| Sunday | Sep 8 | International Literacy Day | United Nations observance | |
| Sunday | Sep 8 | National Grandparents Day | Observance | |
| Tuesday | Sep 10 | World Suicide Prevention Day | United Nations observance | |
| Wednesday | Sep 11 | Patriot Day | Observance | |
| Thursday | Sep 12 | International Day for South-South Cooperation | United Nations observance | |
| Friday | Sep 13 | Friday the 13th | Worldwide observance | |
| Friday | Sep 13 | International Programmers' Day | Worldwide observance | |
| Saturday | Sep 14 | Yom Kippur | Jewish holiday | |
| Sunday | Sep 15 | International Day of Democracy | United Nations observance | |
| Monday | Sep 16 | International Day for the Preservation of the Ozone Layer | United Nations observance | |
| Tuesday | Sep 17 | Constitution Day and Citizenship Day | Observance | |
| Thursday | Sep 19 | First day of Sukkot | Jewish holiday | |
| Thursday | Sep 19 | International Talk Like a Pirate Day | Worldwide observance | |
| Friday | Sep 20 | National POW/MIA Recognition Day | Observance | |
| Saturday | Sep 21 | International Day of Peace | United Nations observance | |
| Sunday | Sep 22 | Emancipation Day | State holiday | Ohio |
| Sunday | Sep 22 | September equinox | Season | |
| Wednesday | Sep 25 | Last day of Sukkot | Jewish holiday | |
| Thursday | Sep 26 | Shmini Atzeret/Simchat Torah | Jewish holiday | |
| Thursday | Sep 26 | World Maritime Day | United Nations observance | |
| Friday | Sep 27 | World Tourism Day | United Nations observance | |
| Saturday | Sep 28 | World Rabies Day | United Nations observance | |
| Sunday | Sep 29 | World Heart Day | United Nations observance | |
| Sunday | Sep 29 | Gold Star Mother's Day | Observance | |
| Tuesday | Oct 1 | International Day of Older Persons | United Nations observance | |
| Wednesday | Oct 2 | International Day of Non-Violence | United Nations observance | |
| Friday | Oct 4 | Feast of St Francis of Assisi | Christian | |
| Saturday | Oct 5 | World Teachers' Day | United Nations observance | |
| Monday | Oct 7 | Child Health Day | Observance | |
| Monday | Oct 7 | World Habitat Day | United Nations observance | |
| Wednesday | Oct 9 | International Day for Natural Disaster Reduction | United Nations observance | |
| Wednesday | Oct 9 | World Post Day | United Nations observance | |
| Wednesday | Oct 9 | Leif Erikson Day | Observance | |
| Thursday | Oct 10 | World Mental Health Day | United Nations observance | |
| Thursday | Oct 10 | World Sight Day | United Nations observance | |
| Friday | Oct 11 | International Day of the Girl Child | United Nations observance | |
| Monday | Oct 14 | Indigenous People's Day | Local observance | California |
| Monday | Oct 14 | Columbus Day | National holiday | All except CA, HI, NV |
| Monday | Oct 14 | Native Americans' Day | Local observance | South Dakota |
| Tuesday | Oct 15 | International Day of Rural Women | United Nations observance | |
| Tuesday | Oct 15 | Eid-al-Adha | Muslim | |
| Tuesday | Oct 15 | White Cane Safety Day | Observance | |
| Wednesday | Oct 16 | World Food Day | United Nations observance | |
| Wednesday | Oct 16 | Boss's Day | Observance | |
| Thursday | Oct 17 | International Day for the Eradication of Poverty | United Nations observance | |
| Friday | Oct 18 | Alaska Day | State holiday | Alaska |
| Thursday | Oct 24 | World Development Information Day | United Nations observance | |
| Thursday | Oct 24 | United Nations Day | United Nations observance | |
| Friday | Oct 25 | Nevada Day | State holiday | Nevada |
| Sunday | Oct 27 | World Day for Audiovisual Heritage | United Nations observance | |
| Tuesday | Oct 29 | World Stroke Day | Worldwide observance | |
| Thursday | Oct 31 | Halloween | Observance | |
| Friday | Nov 1 | All Saints' Day | Christian | |
| Saturday | Nov 2 | All Souls' Day | Christian | |
| Sunday | Nov 3 | Daylight Saving Time ends | Clock change/Daylight Saving Time | |
| Sunday | Nov 3 | Diwali/Deepavali | Observance | |
| Tuesday | Nov 5 | Muharram/Islamic New Year | Muslim | |
| Wednesday | Nov 6 | International Day for Preventing the Exploitation of the Environment in War and Armed Conflict | United Nations observance | |
| Sunday | Nov 10 | World Science Day for Peace and Development | United Nations observance | |
| Monday | Nov 11 | Veterans Day | National holiday | |
| Thursday | Nov 14 | World Diabetes Day | United Nations observance | |
| Thursday | Nov 14 | World Chronic Obstructive Pulmonary Disease Day | United Nations observance | |
| Saturday | Nov 16 | International Day for Tolerance | United Nations observance | |
| Sunday | Nov 17 | World Day of Remembrance for Road Traffic Victims | United Nations observance | |
| Tuesday | Nov 19 | International Men's Day | Worldwide observance | |
| Wednesday | Nov 20 | Universal Children's Day | United Nations observance | |
| Wednesday | Nov 20 | Africa Industrialization Day | United Nations observance | |
| Thursday | Nov 21 | World Philosophy Day | United Nations observance | |
| Thursday | Nov 21 | World Television Day | United Nations observance | |
| Monday | Nov 25 | International Day for the Elimination of Violence against Women | United Nations observance | |
| Thursday | Nov 28 | First Day of Hanukkah | Jewish holiday | |
| Thursday | Nov 28 | Thanksgiving Day | National holiday | |
| Friday | Nov 29 | Black Friday | State holiday | 17 states |
| Friday | Nov 29 | American Indian Heritage Day | State holiday | Maryland |
| Friday | Nov 29 | Presidents' Day | State holiday | New Mexico |
| Friday | Nov 29 | International Day of Solidarity with the Palestinian People | United Nations observance | |
| Friday | Nov 29 | Lincoln's Birthday | State holiday | Indiana |
| Sunday | Dec 1 | World AIDS Day | United Nations observance | |
| Sunday | Dec 1 | First Sunday Advent | Christian | |
| Monday | Dec 2 | International Day for the Abolition of Slavery | United Nations observance | |
| Monday | Dec 2 | Cyber Monday | Observance | |
| Tuesday | Dec 3 | International Day of Persons with Disabilities | United Nations observance | |
| Thursday | Dec 5 | Last day of Hanukkah | Jewish holiday | |
| Thursday | Dec 5 | International Volunteer Day for Economic and Social Development | United Nations observance | |
| Saturday | Dec 7 | International Civil Aviation Day | United Nations observance | |
| Saturday | Dec 7 | Pearl Harbor Remembrance Day | Observance | |
| Sunday | Dec 8 | Feast of the Immaculate Conception | Christian | |
| Monday | Dec 9 | International Anti-Corruption Day | United Nations observance | |
| Tuesday | Dec 10 | Human Rights Day | United Nations observance | |
| Wednesday | Dec 11 | International Mountain Day | United Nations observance | |
| Friday | Dec 13 | Friday the 13th | Worldwide observance | |
| Tuesday | Dec 17 | Wright Brothers Day | Observance | |
| Tuesday | Dec 17 | Pan American Aviation Day | Observance | |
| Wednesday | Dec 18 | International Migrants Day | United Nations observance | |
| Friday | Dec 20 | International Human Solidarity Day | United Nations observance | |
| Saturday | Dec 21 | December Solstice | Season | |
| Tuesday | Dec 24 | Christmas Eve | Observance, Christian | |
| Wednesday | Dec 25 | Christmas Day | National holiday, Christian | |
| Thursday | Dec 26 | Kwanzaa (until Jan 1) | Observance | |
| Tuesday | Dec 31 | New Year's Eve | Observance | |
