December Observances 2025. The calendars below are marked with united nations international holiday observations. Calendar view of observances for food observed during december 2025 by around the world.
December 2025 marks another rotation around the sun, bringing a season of reflection, celebration, and anticipation for the new year. Knowinsiders present the top 20 holidays and festivals celebrated worldwide in 2025, based on their popularity, cultural significance, scale, and global reach.