| Jan 1 | Asarah B'Tevet |
| Jan 1 | New Year's Day |
| Jan 3 | The Prophet's Birthday |
| Jan 4 | World Braille Day |
| Jan 6 | Epiphany |
| Jan 7 | Orthodox Christmas Day |
| Jan 7 | International Programmers' Day |
| Jan 8 | Battle of New Orleans (Louisiana) |
| Jan 13 | Stephen Foster Memorial Day |
| Jan 14 | Orthodox New Year |
| Jan 16 | Lee-Jackson Day (Virginia) |
| Jan 18 | World Religion Day |
| Jan 19 | Martin Luther King Jr. Day |
| Jan 19 | Robert E. Lee's Birthday (AL, AR, MS) |
| Jan 19 | Robert E. Lee's Birthday (Florida) |
| Jan 19 | Confederate Heroes' Day (Texas) |
| Jan 19 | Idaho Human Rights Day (Idaho) |
| Jan 19 | Civil Rights Day (Arizona, New Hampshire) |
| Jan 25 | World Leprosy Day |
| Jan 26 | International Customs Day |
| Jan 27 | World Holocaust Victims Remembrance Day |
| Jan 29 | Kansas Day (Kansas) |
| Feb 1 | National Freedom Day |
| Feb 1 | First Day of Black History Month |
| Feb 2 | World Wetlands Day |
| Feb 2 | Groundhog Day |
| Feb 4 | Tu Bishvat/Tu B'Shevat |
| Feb 4 | World Cancer Day |
| Feb 4 | Rosa Parks Day (California, Missouri) |
| Feb 4 | Rosa Parks Day (New York) |
| Feb 4 | National Girls and Women in Sports Day |
| Feb 6 | International Day of Zero Tolerance for Female Genital Mutilation |
| Feb 6 | Ronald Reagan Day (California) |
| Feb 6 | National Wear Red Day |
| Feb 11 | World Day of the Sick |
| Feb 12 | Lincoln's Birthday (CT, IL, MO, NY) |
| Feb 12 | Lincoln's Birthday (Florida) |
| Feb 12 | Georgia Day (Georgia) |
| Feb 13 | World Radio Day |
| Feb 13 | Friday the 13th |
| Feb 14 | Valentine's Day |
| Feb 14 | Statehood Day (Arizona) |
| Feb 15 | Susan B. Anthony's Birthday (Florida, Wisconsin) |
| Feb 15 | Susan B. Anthony Day (New York) |
| Feb 16 | Presidents' Day |
| Feb 16 | Presidents' Day (Most regions) |
| Feb 16 | Presidents' Day (KS, KY, LA, WI) |
| Feb 16 | Daisy Gatson Bates Day (Arkansas) |
| Feb 16 | Elizabeth Peratrovich Day (Alaska) |
| Feb 17 | Shrove Tuesday/Mardi Gras |
| Feb 17 | Shrove Tuesday/Mardi Gras (AL*, FL*, LA, MS*) |
| Feb 18 | Ash Wednesday |
| Feb 19 | Lunar New Year |
| Feb 20 | World Day of Social Justice |
| Feb 21 | International Mother Language Day |
| Feb 25 | African-American Scientist and Inventor Day (Virginia) |
| Feb 25 | George Rogers Clark Day (Indiana) |
| Feb 28 | Linus Pauling Day (Oregon) |
| Mar 1 | Zero Discrimination Day |
| Mar 1 | Self-Injury Awareness Day |
| Mar 1 | St. David's Day |
| Mar 1 | First Day of Women's History Month |
| Mar 1 | First Day of Irish American Heritage Month |
| Mar 2 | Texas Independence Day (Texas) |
| Mar 2 | Casimir Pulaski Day (Illinois, Indiana) |
| Mar 2 | Read Across America Day |
| Mar 3 | World Wildlife Day |
| Mar 3 | Town Meeting Day (Vermont) |
| Mar 4 | Casimir Pulaski Day (Wisconsin) |
| Mar 5 | Purim |
| Mar 6 | Employee Appreciation Day |
| Mar 8 | International Women's Day |
| Mar 8 | Daylight Saving Time starts |
| Mar 12 | World Kidney Day |
| Mar 13 | Friday the 13th |
| Mar 17 | St. Patrick's Day |
| Mar 17 | Evacuation Day (Massachusetts) |
| Mar 20 | French Language Day |
| Mar 20 | International Day of Happiness |
| Mar 20 | March Equinox |
| Mar 21 | World Day to Eliminate Racial Discrimination |
| Mar 21 | World Poetry Day |
| Mar 21 | International Day of Nowruz |
| Mar 21 | World Down Syndrome Day |
| Mar 21 | International Day of Forests |
| Mar 22 | World Water Day |
| Mar 23 | World Meteorological Day |
| Mar 24 | World Tuberculosis Day |
| Mar 24 | World Day for Truth concerning Human Rights Violations |
| Mar 25 | Day to Remember Slavery Victims and Transatlantic Slave Trade |
| Mar 25 | World Solidarity Day for Detained and Missing Workers |
| Mar 25 | Maryland Day (Maryland) |
| Mar 26 | Prince Jonah Kuhio Kalanianaole Day (Hawaii) |
| Mar 28 | Earth Hour |
| Mar 29 | Palm Sunday |
| Mar 30 | Wyoming Veterans Welcome Home Day (Wyoming) |
| Mar 30 | Doctors' Day |
| Mar 30 | Seward's Day (Alaska) |
| Mar 30 | Vietnam Veterans Day (Delaware) |
| Mar 30 | Vietnam Veteran Recognition Day (West Virginia) |
| Mar 31 | International Transgender Day of Visibility |
| Mar 31 | César Chávez Day (Many regions) |
| Apr 1 | April Fool's Day |
| Apr 2 | Maundy Thursday |
| Apr 2 | World Autism Awareness Day |
| Apr 2 | Pascua Florida Day (Florida) |
| Apr 3 | Passover Eve |
| Apr 3 | Good Friday (Many regions) |
| Apr 4 | Holy Saturday |
| Apr 4 | Passover (first day) |
| Apr 4 | Mine Awareness Day |
| Apr 5 | Easter Sunday |
| Apr 6 | International Sport Day |
| Apr 6 | Easter Monday |
| Apr 6 | National Tartan Day |
| Apr 7 | United Nations' World Health Day |
| Apr 7 | Day to Remember Rwanda Genocide Victims |
| Apr 10 | Orthodox Good Friday |
| Apr 11 | Last Day of Passover |
| Apr 11 | Orthodox Holy Saturday |
| Apr 12 | Orthodox Easter |
| Apr 12 | International Day of Human Space Flight |
| Apr 13 | Orthodox Easter Monday |
| Apr 13 | Thomas Jefferson's Birthday |
| Apr 14 | National Library Workers' Day |
| Apr 15 | Yom HaShoah |
| Apr 15 | World Art Day |
| Apr 15 | Tax Day |
| Apr 15 | Father Damien Day (Hawaii) |
| Apr 16 | Emancipation Day (District of Columbia) |
| Apr 17 | Global Youth Service Day |
| Apr 18 | International Day for Monuments and Sites |
| Apr 20 | Chinese Language Day |
| Apr 20 | Patriots' Day (Maine, Massachusetts) |
| Apr 21 | San Jacinto Day (Texas) |
| Apr 22 | Earth Day |
| Apr 22 | Oklahoma Day (Oklahoma) |
| Apr 22 | Administrative Professionals Day |
| Apr 23 | Yom Ha'atzmaut |
| Apr 23 | World Book and Copyright Day |
| Apr 23 | International Girls in ICT Day |
| Apr 23 | World Spanish Language Day |
| Apr 23 | English Language Day |
| Apr 23 | Take our Daughters and Sons to Work Day |
| Apr 24 | Arbor Day (Nebraska) |
| Apr 24 | Arbor Day (Delaware) |
| Apr 25 | World Malaria Day |
| Apr 26 | World Intellectual Property Day |
| Apr 26 | Confederate Memorial Day (Florida) |
| Apr 27 | Arbor Day (Wyoming) |
| Apr 27 | Confederate Memorial Day (Mississippi) |
| Apr 27 | Confederate Memorial Day (Alabama) |
| Apr 27 | 'Confederate Memorial Day' observed (Florida) |
| Apr 27 | Confederate Memorial Day (Georgia) |
| Apr 28 | World Day for Safety and Health at Work |
| Apr 29 | Day to Remember Chemical Warfare Victims |
| Apr 30 | International Jazz Day |
| May 1 | Law Day |
| May 1 | Loyalty Day |
| May 1 | Lei Day (Hawaii) |
| May 1 | First Day of Military Appreciation Month |
| May 1 | First Day of Asian Pacific American Heritage Month |
| May 1 | First Day of Jewish American Heritage Month |
| May 2 | National Explosive Ordnance Disposal (EOD) Day |
| May 3 | World Press Freedom Day |
| May 3 | International Family Equality Day |
| May 4 | Kent State Shootings Remembrance (Ohio) |
| May 4 | Rhode Island Independence Day (Rhode Island) |
| May 5 | Cinco de Mayo |
| May 5 | Primary Election Day (Indiana) |
| May 5 | National Teacher Appreciation Day |
| May 6 | National Nurses Day |
| May 7 | Lag BaOmer |
| May 7 | National Day of Prayer |
| May 7 | West Virginia Day of Prayer (West Virginia) |
| May 8 | Time to Remember Lost Lives From World War II |
| May 8 | World Ovarian Cancer Day |
| May 8 | World Red Cross and Red Crescent Day |
| May 8 | Truman Day (Missouri) |
| May 8 | Victory in Europe Day |
| May 8 | Native American Day (Wyoming) |
| May 8 | Military Spouse Appreciation Day (Delaware) |
| May 8 | Military Spouse Appreciation Day |
| May 9 | World Migratory Bird Day |
| May 10 | Mother's Day (Arizona) |
| May 10 | Mother's Day |
| May 10 | Confederate Memorial Day (North Carolina) |
| May 10 | Confederate Memorial Day (South Carolina) |
| May 11 | 'Confederate Memorial Day' observed (South Carolina) |
| May 12 | International Nurses Day |
| May 14 | Ascension Day |
| May 15 | International Day of Families |
| May 15 | Peace Officers Memorial Day |
| May 15 | National Defense Transportation Day |
| May 16 | Isra and Mi'raj |
| May 16 | Armed Forces Day |
| May 17 | World Telecommunication and Information Society Day |
| May 20 | World Autoimmune Arthritis Day |
| May 20 | Emergency Medical Services for Children Day |
| May 21 | World Day for Cultural Diversity |
| May 22 | World Biological Diversity Day |
| May 22 | National Maritime Day |
| May 22 | Harvey Milk Day (California) |
| May 23 | International Day to End Obstetric Fistula |
| May 24 | Pentecost |
| May 24 | Shavuot |
| May 25 | Whit Monday |
| May 25 | African Liberation Day |
| May 25 | Memorial Day |
| May 25 | Decoration Day (AK, AL, AR, AZ, CA) |
| May 25 | Jefferson Davis' Birthday (Mississippi) |
| May 25 | National Missing Children's Day |
| May 29 | International Day of United Nations Peacekeepers |
| May 31 | Trinity Sunday |
| May 31 | World No Tobacco Day |
| Jun 1 | Global Day of Parents |
| Jun 1 | Vesak Day |
| Jun 1 | First Day of Pride Month |
| Jun 1 | First Day of Caribbean-American Heritage Month |
| Jun 1 | Statehood Day (Kentucky, Tennessee) |
| Jun 1 | Jefferson Davis' Birthday (Alabama) |
| Jun 3 | Jefferson Davis' Birthday (Florida) |
| Jun 4 | Corpus Christi |
| Jun 4 | World Day for Child Victims of Aggression |
| Jun 5 | World Environment Day |
| Jun 6 | Day of the Russian Language |
| Jun 6 | D-Day |
| Jun 8 | World Oceans Day |
| Jun 11 | Kamehameha Day (Hawaii) |
| Jun 12 | World Day Against Child Labour |
| Jun 12 | Loving Day |
| Jun 13 | International Albinism Awareness Day |
| Jun 14 | World Blood Donor Day |
| Jun 14 | Army Birthday |
| Jun 14 | Flag Day |
| Jun 15 | World Elder Abuse Awareness Day |
| Jun 16 | International Day of Family Remittances |
| Jun 17 | World Day to Combat Desertification |
| Jun 17 | Bunker Hill Day (Massachusetts) |
| Jun 18 | First Day of Ramadan |
| Jun 19 | Juneteenth |
| Jun 19 | International Day for the Elimination of Sexual Violence in Conflict |
| Jun 19 | Juneteenth (AL, CO, LA) |
| Jun 19 | Juneteenth Day (FL, GA, WI) |
| Jun 19 | Juneteenth National Freedom Day (Illinois, Maryland) |
| Jun 19 | Juneteenth (Iowa, Washington) |
| Jun 19 | Juneteenth (Kansas) |
| Jun 19 | National Juneteenth Freedom Day (Kentucky) |
| Jun 19 | Juneteenth Freedom Day (Mississippi) |
| Jun 19 | Emancipation Day (Missouri) |
| Jun 19 | Juneteenth (Nebraska) |
| Jun 19 | Juneteenth Day (Nevada) |
| Jun 19 | Juneteenth (New Hampshire) |
| Jun 19 | Juneteenth Freedom Day (New Mexico) |
| Jun 19 | Juneteenth Freedom Day (New York) |
| Jun 19 | Juneteenth National Freedom Day (Ohio) |
| Jun 19 | Juneteenth (Oregon) |
| Jun 19 | Juneteenth Independence Day (Rhode Island) |
| Jun 19 | Juneteenth Celebration of Freedom Day (South Carolina) |
| Jun 19 | Juneteenth (West Virginia) |
| Jun 19 | Juneteenth (Wyoming) |
| Jun 19 | Emancipation Day (Texas) |
| Jun 20 | World Refugee Day |
| Jun 20 | Juneteenth Day (Alaska, Arkansas) |
| Jun 20 | Juneteenth National Freedom Day (California) |
| Jun 20 | Juneteenth Independence Day (Connecticut) |
| Jun 20 | Juneteenth National Freedom Day (Delaware) |
| Jun 20 | Juneteenth (Maine) |
| Jun 20 | Juneteenth National Freedom Day (Michigan) |
| Jun 20 | Juneteenth (Minnesota) |
| Jun 20 | Juneteenth National Freedom Day (Montana, Oklahoma) |
| Jun 20 | Juneteenth National Freedom Day (Vermont) |
| Jun 20 | Juneteenth Freedom Day (Virginia) |
| Jun 20 | West Virginia Day (West Virginia) |
| Jun 20 | American Eagle Day |
| Jun 21 | International Day of Yoga |
| Jun 21 | Father's Day |
| Jun 21 | Father's Day (Arizona) |
| Jun 21 | Juneteenth Independence Day (Massachusetts) |
| Jun 21 | June Solstice |
| Jun 23 | Public Service Day |
| Jun 23 | International Widows' Day |
| Jun 25 | Day of the Seafarer |
| Jun 26 | World Day against Drug Abuse and Trafficking |
| Jun 26 | World Day to Support Torture Victims |
| Jun 28 | Carolina Day (South Carolina) |
| Jul 3 | 'Independence Day' day off (AK, AL, AR, AZ, OK) |
| Jul 3 | 'Independence Day' day off |
| Jul 4 | International Day of Cooperatives |
| Jul 4 | Independence Day (California) |
| Jul 4 | Independence Day |
| Jul 4 | Independence Day (AK, AL, AR, AZ, OK) |
| Jul 11 | World Population Day |
| Jul 13 | Lailat al-Qadr |
| Jul 13 | Nathan Bedford Forrest Day (Tennessee) |
| Jul 14 | Bastille Day |
| Jul 15 | World Youth Skills Day |
| Jul 18 | Nelson Mandela Day |
| Jul 24 | Pioneer Day (Utah) |
| Jul 26 | Tisha B'Av |
| Jul 26 | Parents' Day |
| Jul 27 | Korean War Veteran Recognition Day (West Virginia) |
| Jul 27 | National Korean War Veterans Armistice Day |
| Jul 28 | World Hepatitis Day |
| Jul 30 | World Friendship Day |
| Jul 30 | World Day Against Trafficking in Persons |
| Aug 1 | Colorado Day (Colorado) |
| Aug 2 | American Family Day (Arizona) |
| Aug 4 | Coast Guard Birthday |
| Aug 7 | Purple Heart Day (West Virginia) |
| Aug 7 | Purple Heart Day |
| Aug 9 | World Indigenous Peoples’ Day |
| Aug 10 | Victory Day (Rhode Island) |
| Aug 12 | International Youth Day |
| Aug 15 | Assumption of Mary |
| Aug 16 | National Navajo Code Talkers Day (Arizona) |
| Aug 16 | Bennington Battle Day (Vermont) |
| Aug 16 | National Senior Citizens Day |
| Aug 17 | 'Bennington Battle Day' observed (Vermont) |
| Aug 19 | World Humanitarian Day |
| Aug 19 | National Aviation Day |
| Aug 21 | Statehood Day (Hawaii) |
| Aug 23 | World Day for Slave Trade Abolition |
| Aug 26 | Women's Equality Day |
| Aug 27 | Lyndon Baines Johnson Day (Texas) |
| Aug 29 | International Day against Nuclear Tests |
| Aug 30 | World Day of Victims of Enforced Disappearance |
| Aug 31 | International Overdose Awareness Day |
| Sep 4 | World Sexual Health Day |
| Sep 5 | International Day of Charity |
| Sep 7 | Labor Day |
| Sep 8 | International Literacy Day |
| Sep 9 | California Admission Day (California) |
| Sep 10 | World Suicide Prevention Day |
| Sep 11 | Patriot Day |
| Sep 12 | International South-South Cooperation Day |
| Sep 12 | Carl Garner Federal Lands Cleanup Day |
| Sep 12 | Native American Day (Delaware) |
| Sep 13 | International Programmers' Day |
| Sep 13 | National Grandparents Day |
| Sep 13 | Constitution Commemoration Day (Arizona) |
| Sep 14 | Rosh Hashana |
| Sep 14 | Rosh Hashana (Texas) |
| Sep 15 | International Day of Democracy |
| Sep 15 | First Day of National Hispanic Heritage Month |
| Sep 16 | World Ozone Layer Day |
| Sep 17 | Constitution Day and Citizenship Day |
| Sep 18 | Air Force Birthday |
| Sep 18 | National POW/MIA Recognition Day |
| Sep 21 | International Day of Peace |
| Sep 22 | Emancipation Day (Ohio) |
| Sep 23 | Yom Kippur |
| Sep 23 | International Celebrate Bisexuality Day |
| Sep 23 | Yom Kippur (Texas) |
| Sep 23 | September Equinox |
| Sep 24 | Eid al-Adha |
| Sep 24 | World Maritime Day |
| Sep 25 | Native American Day (California, Nevada) |
| Sep 25 | American Indian Heritage Day (Montana, Texas) |
| Sep 25 | Michigan Indian Day (Michigan) |
| Sep 26 | World Day to Eliminate Nuclear Weapons |
| Sep 26 | National Public Lands Day |
| Sep 27 | World Tourism Day |
| Sep 27 | Gold Star Mother's Day |
| Sep 28 | First Day of Sukkot |
| Sep 28 | World Rabies Day |
| Sep 28 | American Indian Day (Tennessee) |
| Sep 29 | World Heart Day |
| Oct 1 | International Day of Older Persons |
| Oct 1 | World Vegetarian Day |
| Oct 2 | International Day of Non-Violence |
| Oct 4 | Feast of St Francis of Assisi |
| Oct 4 | Last Day of Sukkot |
| Oct 5 | Shmini Atzeret |
| Oct 5 | World Teachers' Day |
| Oct 5 | World Habitat Day |
| Oct 5 | Child Health Day |
| Oct 6 | Simchat Torah |
| Oct 6 | German American Day |
| Oct 7 | World Cerebral Palsy Day |
| Oct 8 | World Sight Day |
| Oct 9 | World Post Day |
| Oct 9 | Leif Erikson Day |
| Oct 10 | World Mental Health Day |
| Oct 11 | International Day of the Girl Child |
| Oct 11 | Casimir Pulaski Day (Michigan, Rhode Island) |
| Oct 12 | Columbus Day (Most regions) |
| Oct 12 | Columbus Day |
| Oct 12 | Fraternal Day (Alabama) |
| Oct 12 | Native American Day (South Dakota) |
| Oct 12 | Indigenous People's Day (Many regions) |
| Oct 12 | American Indian Heritage Day (Alabama) |
| Oct 13 | Navy Birthday |
| Oct 14 | World Day for Natural Disaster Reduction |
| Oct 15 | Muharram |
| Oct 15 | International Day of Rural Women |
| Oct 15 | White Cane Safety Day |
| Oct 16 | World Food Day |
| Oct 16 | Boss's Day |
| Oct 17 | World Day for Poverty Eradication |
| Oct 17 | Sweetest Day (Many regions) |
| Oct 18 | Alaska Day (Alaska) |
| Oct 19 | 'Alaska Day' observed (Alaska) |
| Oct 20 | World Statistics Day |
| Oct 24 | Ashura |
| Oct 24 | United Nations Day |
| Oct 24 | World Development Information Day |
| Oct 27 | World Day for Audiovisual Heritage |
| Oct 29 | World Stroke Day |
| Oct 30 | Nevada Day (Nevada) |
| Oct 31 | World Cities Day |
| Oct 31 | Halloween |
| Nov 1 | All Saints' Day |
| Nov 1 | World Vegan Day |
| Nov 1 | First Day of Native American Heritage Month |
| Nov 1 | Daylight Saving Time ends |
| Nov 2 | All Souls' Day |
| Nov 2 | International Day to End Impunity |
| Nov 3 | Election Day |
| Nov 3 | Election Day (New Jersey) |
| Nov 3 | Election Day (Indiana, New York) |
| Nov 6 | World Day to Protect the Environment in War |
| Nov 9 | Barack Obama Day (Alabama) |
| Nov 10 | World Science Day |
| Nov 10 | Marine Corps Birthday |
| Nov 11 | Veterans Day |
| Nov 12 | World Pneumonia Day |
| Nov 13 | Friday the 13th |
| Nov 14 | World Diabetes Day |
| Nov 15 | World Day for Road Traffic Victims |
| Nov 16 | International Day for Tolerance |
| Nov 17 | World Prematurity Day |
| Nov 19 | World Philosophy Day |
| Nov 19 | World Toilet Day |
| Nov 19 | International Men's Day |
| Nov 19 | George Rogers Clark Day (Ohio) |
| Nov 20 | Universal Children's Day |
| Nov 20 | Africa Industrialization Day |
| Nov 20 | Transgender Day of Remembrance |
| Nov 21 | World Television Day |
| Nov 25 | World Day to Eliminate Violence on Women |
| Nov 26 | Thanksgiving Day |
| Nov 27 | Robert E. Lee's Birthday (Georgia) |
| Nov 27 | Presidents' Day (New Mexico) |
| Nov 27 | Lincoln's Birthday/Lincoln's Day (Indiana) |
| Nov 27 | Day After Thanksgiving (Many regions) |
| Nov 27 | Family Day (Nevada) |
| Nov 27 | Acadian Day (Louisiana) |
| Nov 27 | Black Friday |
| Nov 27 | American Indian Heritage Day (Maryland) |
| Nov 27 | Native American Heritage Day |
| Nov 27 | Native American Heritage Day (Washington) |
| Nov 29 | First Sunday of Advent |
| Nov 29 | World Solidarity Day with Palestinian People |
| Nov 29 | Nellie Tayloe Ross's Birthday (Wyoming) |
| Nov 30 | Cyber Monday |
| Dec 1 | World AIDS Day |
| Dec 1 | Rosa Parks Day (Ohio) |
| Dec 1 | Giving Tuesday |
| Dec 2 | World Day for Slavery Abolition |
| Dec 3 | World Day for Persons with Disabilities |
| Dec 5 | International Volunteer Day |
| Dec 5 | World Soil Day |
| Dec 6 | St Nicholas Day |
| Dec 7 | Chanukah/Hanukkah (first day) |
| Dec 7 | International Civil Aviation Day |
| Dec 7 | Pearl Harbor Remembrance Day |
| Dec 7 | Pearl Harbor Remembrance Day (Alaska, Wyoming) |
| Dec 7 | Delaware Day (Delaware) |
| Dec 8 | Feast of the Immaculate Conception |
| Dec 9 | International Anti-Corruption Day |
| Dec 9 | World Genocide Commemoration Day |
| Dec 10 | Human Rights Day |
| Dec 10 | Wyoming Day (Wyoming) |
| Dec 11 | International Mountain Day |
| Dec 12 | Feast of Our Lady of Guadalupe |
| Dec 13 | National Guard Birthday |
| Dec 14 | Last Day of Chanukah |
| Dec 15 | Bill of Rights Day |
| Dec 17 | Pan American Aviation Day |
| Dec 17 | Wright Brothers Day |
| Dec 18 | International Migrants Day |
| Dec 18 | Arabic Language Day |
| Dec 20 | International Human Solidarity Day |
| Dec 21 | December Solstice |
| Dec 22 | Asarah B'Tevet |
| Dec 24 | The Prophet's Birthday |
| Dec 24 | Christmas Eve |
| Dec 24 | Christmas Eve (Many regions) |
| Dec 24 | Washington's Birthday (Georgia, Indiana) |
| Dec 25 | Christmas Day (All) |
| Dec 25 | Christmas Day |
| Dec 26 | Kwanzaa (first day) |
| Dec 26 | Day After Christmas Day (KS, KY, NC, SC, TX) |
| Dec 26 | Day After Christmas Day |
| Dec 31 | New Year's Eve |
| Dec 31 | New Year's Eve (LA, MI, WI) |
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