Events that occurred on 25 March.
 On Earth
- 1934 - J.R.R. Tolkien's poem Firiel is published within The Chronicle of the Convents of the Sacred Heart (Volume IV).
- 1967 - The Scotsman publishes an interview of J.R.R. Tolkien by William Foster.
- 1968 - Actor Michael Reisz is born.
- 1979 - Actor Lee Pace is born.
- 1986 - The Swiss Tolkien Society Eredain is founded.
- Since 2003 - Tolkien Reading Day.
- 2014 - Anglo-Saxon Community in J.R.R. Tolkien's the Lord of the Rings is published.
- 2015 - Tolkien Estate launches a new version of the website tolkienestate.com, including many articles.
- 2019 - Tolkien the Pagan? is published.
 In Arda
- T.A. 2510:
- T.A. 3019:
- T.A. 3020:
- T.A. 3021: