Events that occurred on 17 July.
 On Earth
- 1912 - Author Barbara Strachey is born.
- 1918 - J.R.R. Tolkien attends a medical board examination in Kingston-upon-Hull.
- 1971 - J.R.R. Tolkien writes Letter 325.
- 1981 - The Tolkien Quiz Book, the book by Robinson and Wilson, is published.
- 1982 - The first episode of the new version of the 1981 radio series of The Lord of the Rings is aired on BBC Radio 4.
- 1998 - Author Paul H. Kocher dies.
- 1998 - Mythcon 29 in Wheaton, Illinois.
- 2004 - The Lord of the Rings Symphony in Seattle, Washington.
- 2009 - Mythcon 40 in Los Angeles, California.
- 2010 - Tolkien Thing 2010 in Bad Hersfeld, Germany.
- 2010 - Mythcon 41 in Dallas, Texas.
- 2011 - Tolkien Thing 2011 in Breuberg, Germany.
- 2011 - Mythcon 42 in Albuquerque, New Mexico.
 In Arda
- T.A. 3018:
- T.A. 3019:
- New Moon