Events that occurred on 10 September.
 On Earth
- 1950 - J.R.R. Tolkien returns from a stay at his son's cottage where he made some final revisions to The Lord of the Rings (see Letter 134).
- 1950 - J.R.R. Tolkien writes Letter 129.
- 1951 - First day of the Congrès Internationale de Philologie Moderne at the University of Liège, a conference in which J.R.R. Tolkien delivers the paper "Middle English 'Losenger'".
- 1957 - J.R.R. Tolkien wins the International Fantasy Award.
- 1959 - Actor Jim Meskimen is born.
- 1964 - J.R.R. Tolkien writes Letter 263.
- 2007 - "from mind to mind": Robert Browning and J.R.R. Tolkien is published.
- 2010 - Bulgarian Tolkien Society's 6th Tolkien-Fest in Sofia.
- 2010 - The Lord of the Rings Online goes free-to-play for the general public in North America.
- 2015 - Oxonmoot 2015 at St Antony's College.