| Dec 1 | World AIDS Day | Observed to raise awareness about HIV/AIDS, promote prevention, and support those affected. |
| Dec 2 | National Pollution Control Day | Raises awareness about pollution and honors victims of the 1984 Bhopal Gas Tragedy. |
| Dec 2 | International Day for the Abolition of Slavery | Highlights the fight against modern slavery, including human trafficking and forced labor. |
| Dec 3 | International Day of Persons with Disabilities | Promotes equal rights and inclusion for people with disabilities. |
| Dec 4 | International Day of Banks | Recognizes the role of banks in supporting economies and financial inclusion. |
| Dec 4 | International Day Against Unilateral Coercive Measures | Raises awareness about unfair economic and political actions imposed by countries. |
| Dec 5 | World Soil Day | Highlights the importance of healthy soil for food security and environmental protection. |
| Dec 5 | International Volunteer Day | Celebrates the contributions of volunteers in various fields like education, health, and disaster relief. |
| Dec 6 | Mahaparinirvan Diwas | Marks the death anniversary of Dr. B.R. Ambedkar, honoring his contributions to social justice and the Indian Constitution. |
| Dec 6 | National Microwave Oven Day | Celebrates the invention and convenience of microwave ovens. |
| Dec 7 | Armed Forces Flag Day | Honors the bravery and sacrifice of Indian soldiers, encouraging donations for veterans and their families. |
| Dec 7 | International Civil Aviation Day | Celebrates the role of aviation in global connectivity and development. |
| Dec 8 | Bodhi Day | Commemorates the enlightenment of Gautama Buddha, emphasizing meditation and kindness. |
| Dec 9 | International Anti-Corruption Day | Encourages global efforts to fight corruption and promote transparency. |
| Dec 9 | International Day of Commemoration of Genocide Victims | Honors the victims of genocide and promotes prevention through education and remembrance. |
| Dec 10 | Human Rights Day | Marks the anniversary of the Universal Declaration of Human Rights, celebrating equality and justice. |
| Dec 11 | International Mountain Day | Highlights the importance of protecting mountain ecosystems and biodiversity. |
| Dec 11 | UNICEF Day | Celebrates UNICEF's work in protecting children's rights, health, and education. |
| Dec 12 | International Day of Neutrality | Promotes neutrality as a means to maintain peace and resolve conflicts. |
| Dec 12 | Universal Health Coverage Day | Advocates for affordable and quality healthcare for all. |
| Dec 13 | National Horse Day | Celebrates the role of horses in history, culture, and agriculture. |
| Dec 14 | National Energy Conservation Day | Encourages energy efficiency and the use of renewable energy. |
| Dec 16 | Vijay Diwas | Commemorates India's victory in the 1971 war against Pakistan and the creation of Bangladesh. |
| Dec 18 | Minorities Rights Day | Promotes the rights and equality of minority communities in India. |
| Dec 18 | International Migrants Day | Recognizes the contributions and challenges faced by migrants worldwide. |
| Dec 18 | Arabic Language Day | Celebrates the cultural and historical significance of the Arabic language. |
| Dec 19 | Goa Liberation Day | Marks the end of Portuguese rule in Goa and its integration into India in 1961. |
| Dec 20 | International Human Solidarity Day | Encourages global unity and cooperation to reduce poverty and promote peace. |
| Dec 21 | World Saree Day | Celebrates the cultural significance of the Indian saree. |
| Dec 21 | Winter Solstice | Marks the shortest day and longest night of the year in the Northern Hemisphere. |
| Dec 21 | World Basketball Day | Celebrates the sport of basketball and its global impact. |
| Dec 21 | World Meditation Day | Promotes meditation for mental peace and stress relief. |
| Dec 22 | National Mathematics Day | Honors mathematician Srinivasa Ramanujan and the importance of mathematics. |
| Dec 23 | Kisan Diwas (Farmers' Day) | Celebrates the contributions of farmers to the nation and honors Chaudhary Charan Singh. |
| Dec 24 | National Consumer Rights Day | Raises awareness about consumer rights and protections. |
| Dec 25 | Christmas | Celebrates the birth of Jesus Christ with prayers, decorations, and family gatherings. |
| Dec 25 | Good Governance Day | Honors former Prime Minister Atal Bihari Vajpayee and promotes transparency and accountability in governance. |
| Dec 26 | Veer Bal Diwas | Honors the martyrdom of Guru Gobind Singh's four sons. |
| Dec 26 | Boxing Day | A holiday celebrated mainly in Western countries for charity, shopping, and family gatherings. |
| Dec 27 | International Day of Epidemic Preparedness | Encourages global preparedness for epidemics and strengthening of health systems. |
| Dec 31 | New Year's Eve | Marks the end of the year, celebrated with parties, fireworks, and resolutions for the new year. |