- December is the final month of the Gregorian and Julian calendars with 31 days
- The month features numerous global observances including World AIDS Day on December 1
- December hosts International Anti-Corruption Day and Human Rights Day on the 9th and 10th
December 2025 Calendar: December, the final month of the year, is a time of celebration, reflection, and preparation. As the Gregorian and Julian calendars conclude with this 31-day period, it marks a significant cultural and historical moment. This month is filled with festivities, holidays, and commemorations, making it a time for cultural observance and historical reflection. In Hindu culture, this month has several auspicious days for weddings.
Apart from the festivals, December has a handful of global events which aim to highlight and raise awareness for social causes that affect a significant chunk of the world population, ranging from World AIDS Day to International Anti-Corruption Day to International Day of Persons with Disabilities.
| Date | Day |
| December 1 | World AIDS Day |
| December 2 | National Pollution Control Day, International Day for the Abolition of Slavery |
| December 3 | International Day of Persons with Disabilities |
| December 4 | International Day of Banks, International Day Against Unilateral Coercive Measures |
| December 5 | World Soil Day, International Volunteer Day for Economic and Social Development |
| December 6 | Mahaparinirvan Diwas, National Microwave Oven Day |
| December 7 | Armed Forces Flag Day, International Civil Aviation Day |
| December 8 | Bodhi Day |
| December 9 | International Anti-Corruption Day, International Day of Commemoration and Dignity of the Victims of the Crime of Genocide and of the Prevention of this Crime |
| December 10 | Human Rights Day |
| December 11 | International Mountain Day, UNICEF Day |
| December 12 | International Day of Neutrality, International Universal Health Coverage Day |
| December 13 | National Horse Day |
| December 14 | National Energy Conservation Day |
| December 16 | Vijay Diwas |
| December 18 | Minorities Rights Day in India, International Migrants Day, Arabic Language Day |
| December 19 | Goa Liberation Day |
| December 20 | International Human Solidarity Day |
| December 21 | World Saree Day, Winter Solstice, World Basketball Day, World Meditation Day |
| December 22 | National Mathematics Day |
| December 23 | Kisan Diwas |
| December 24 | National Consumer Rights Day |
| December 25 | Christmas, Good Governance Day |
| December 26 | Veer Bal Diwas, Boxing Day |
| December 27 | International Day of Epidemic Preparedness |
| December 31 | New Year's Eve |
