December 2025 Important Days: List of National and International Important Days, Events

December marks the final chapter of the year and brings a mix of festivals, observances, and awareness days observed across the world. The month holds cultural, social, and historical importance, with events that highlight key global issues as well as days that hold significance in India.

From World AIDS Day at the start of the month to New Year’s Eve on the last day, December 2025 includes several national and international dates that remind us of social responsibilities, cultural heritage, and important milestones. Many families in India also consider this month favourable for weddings, making it a busy and meaningful time.

Below is a detailed look at the important days and events in December 2025

Observed globally to raise awareness about HIV/AIDS and support those living with the condition.

National Pollution Control Day is observed in India to spread awareness about air, water, and noise pollution. The International Day for the Abolition of Slavery focuses on eliminating modern forms of exploitation.

A United Nations-designated day to promote inclusion and rights of persons with disabilities.

The day acknowledges the role of banks in improving living standards and supports discussions on economic cooperation.

World Soil Day highlights the need for soil preservation, while International Volunteer Day recognises the contribution of volunteers in community development.

Mahaparinirvan Diwas marks the death anniversary of Dr B. R. Ambedkar. National Microwave Oven Day is observed mainly in the United States.

India observes Armed Forces Flag Day to honour soldiers. The aviation day focuses on the role of aviation in global connectivity.

Celebrated in Buddhism to mark the enlightenment of Gautama Buddha.

These days highlight the fight against corruption and honour victims of past genocides.

Marks the adoption of the Universal Declaration of Human Rights.

International Mountain Day spreads awareness about mountain ecosystems. UNICEF Day marks the formation of the UN agency for children.

Focused on promoting neutrality in international relations and supporting accessible healthcare.

Observed in some countries to recognise the role of horses in history.

An Indian observance promoting efficient energy use.

Marks India’s victory in the 1971 war.

The day focuses on minority rights in India, global migration issues, and cultural significance of the Arabic language.

Marks the liberation of Goa from Portuguese rule.

A day to encourage unity and cooperation among communities.

A unique date with multiple events, including cultural celebrations, the shortest day of the year, and sports- and health-related observances.

Celebrated in honour of mathematician Srinivasa Ramanujan.

Also known as National Farmers Day, it honours the contribution of farmers.

Observed in India to promote awareness of consumer rights.

Christmas is celebrated worldwide. India also observes Good Governance Day on the same date.

Veer Bal Diwas commemorates the martyrdom of the younger sons of Guru Gobind Singh. Boxing Day is observed in several countries.

A day dedicated to strengthening global readiness against epidemics.

The final day of the year, marked with celebrations across the world.