- X (2011)
- X Files, The (1998)
- X Files: I Want to Believe, The (2008)
- X Moor (2014)
- X the Unknown (1956)
- X-Men (2000)
- X-men Origins: Wolverine (2009)
- X-Men: Apocalypse (2016)
- X-Men: Dark Phoenix (2019)
- X-Men: Days of Future Past (2014)
- X-men: First Class (2011)
- X-Men: The Last Stand (2006)
- X-Rated: The Greatest Adult Movies of All Time (2015)
- X2 (2003)
- X2 (X2: X-Men United) (2003)
- X: The Man with the X-Ray Eyes (1963)
- Xanadu (1980)