S may refer to:
- S (2005), a Boys' Love Genre Light Novel series by Saki Aida and Chihara Nada.
- S, a Shoujo tennis manga by Setona Mizushiro.
- S., a novel by John Updike.
- S, a novel told via marginal notes in another novel, by J. J. Abrams and Doug Dorst.
- S, a short-lived K-Pop group.
- The page on One-Letter Titles.
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