| | | Calendar Date | Weekday | Month | Day | Year | Holiday | Holiday Note | is a Holiday | Is a Legal Holiday |
| Details | | 12/1/2019 | Sunday | December | 1 | 2019 | World AIDS Day | World AIDS Day - UNAIDS reports a 52% reduction in new HIV infections among children and a combined 33% reduction among adults and children since 2001. | | |
| Details | | 12/2/2019 | Monday | December | 2 | 2019 | | | | |
| Details | | 12/3/2019 | Tuesday | December | 3 | 2019 | | | | |
| Details | | 12/4/2019 | Wednesday | December | 4 | 2019 | | | | |
| Details | | 12/5/2019 | Thursday | December | 5 | 2019 | | | | |
| Details | | 12/6/2019 | Friday | December | 6 | 2019 | | | | |
| Details | | 12/7/2019 | Saturday | December | 7 | 2019 | | | | |
| Details | | 12/8/2019 | Sunday | December | 8 | 2019 | | | | |
| Details | | 12/9/2019 | Monday | December | 9 | 2019 | | | | |
| Details | | 12/10/2019 | Tuesday | December | 10 | 2019 | Human Rights Day | Human Rights Day - The date was chosen to honor the United Nations— General Assembly's adoption and proclamation, on 10 December 1948, of the Universal Declaration of Human Rights (UDHR | | |
| Details | | 12/11/2019 | Wednesday | December | 11 | 2019 | | | | |
| Details | | 12/12/2019 | Thursday | December | 12 | 2019 | Nuestra Señora de Guadalupe | Nuestra Señora de Guadalupe - Our Lady of Guadalupe, Mexico, December 12 | | |
| Details | | 12/13/2019 | Friday | December | 13 | 2019 | | | | |
| Details | | 12/14/2019 | Saturday | December | 14 | 2019 | | | | |
| Details | | 12/15/2019 | Sunday | December | 15 | 2019 | | | | |
| Details | | 12/16/2019 | Monday | December | 16 | 2019 | | | | |
| Details | | 12/17/2019 | Tuesday | December | 17 | 2019 | | | | |
| Details | | 12/18/2019 | Wednesday | December | 18 | 2019 | | | | |
| Details | | 12/19/2019 | Thursday | December | 19 | 2019 | | | | |
| Details | | 12/20/2019 | Friday | December | 20 | 2019 | | | | |
| Details | | 12/21/2019 | Saturday | December | 21 | 2019 | Yule | Yule - Celebrated for a few days around the Winter Solstice. The Northern Pagan Midwinter Festival. One of the four solar holidays. | | |
| Details | | 12/22/2019 | Sunday | December | 22 | 2019 | | | | |
| Details | | 12/23/2019 | Monday | December | 23 | 2019 | Tenno Tanjyo Bi; Chanukah Begins | Tenno Tanjyo Bi - Japanese Heisei Emperor's birthday. The date is determined by the reigning Emperor's birthdate. Emperor Akihito was born on this date in 1933.; Chanukah Begins - Jewish Festival of Rededication, also known as the Festival of Lights | | |
| Details | | 12/24/2019 | Tuesday | December | 24 | 2019 | Christmas Eve | Christmas Eve - The evening or entire day preceding Christmas Day, a widely celebrated Christian and secular festival commemorating the birth of Jesus of Nazareth that takes place on December 25. | | |
| Details | | 12/25/2019 | Wednesday | December | 25 | 2019 | Christmas Day (English), Navidad (Español), Noël (French) | Christmas Day (English), Navidad (Español), Noël (French) - A widely celebrated Christian and secular festival commemorating the birth of Jesus of Nazareth that takes place on December 25. | | |
| Details | | 12/26/2019 | Thursday | December | 26 | 2019 | Boxing Day; Kwanzaa begins | Boxing Day - A day for giving gifts. Observed in the United Kingdom, Australia, Canada, New Zealand, and some other Commonwealth nations.; Kwanzaa begins - Kwanzaa is a week-long celebration held in the United States honoring African-American heritage and culture, observed from December 26 to January 1 each year. | | |
| Details | | 12/27/2019 | Friday | December | 27 | 2019 | | | | |
| Details | | 12/28/2019 | Saturday | December | 28 | 2019 | | | | |
| Details | | 12/29/2019 | Sunday | December | 29 | 2019 | | | | |
| Details | | 12/30/2019 | Monday | December | 30 | 2019 | | | | |
| Details | | 12/31/2019 | Tuesday | December | 31 | 2019 | New Year's Eve | New Year's Eve - Last day of the year. Celebrated late into the night. | | |