World Meditation Day
- Observed on December 21.
- World Meditation Day to affirm the right of every individual to attain superior physical and mental health.
Winter Solstice 2025
- Observed on December 21
- Marking the shortest day and longest night in the Northern Hemisphere.
National Mathematics Day 2025
- Observed on December 22 to mark the birth anniversary of Srinivasa Ramanujan.
