Important Dates For 2025 Calendar. This page contains a calendar of all 2025 observances instituted by the united nations and its agencies, and recognised in countries across the world. Check out usa calendar in 2025 for a complete list of public holidays, federal holidays, state holidays and observances.

Here are all of the key important dates to know in the year 2025, month by month, including holidays, celebrations, art shows, sports events, fashion week. Discover important holidays and observances in 2025, from new year’s day to christmas.