Class S may refer to:
- Class S (culture), early 20th century Japanese social practice of female romantic friendships, and a literary genre depicting this practice
- Class S, a stellar classification for carbon stars
- Baltimore and Ohio class S, American steam locomotives
- BNCR Class S, Irish steam locomotive
- GNRI Class S, Irish steam locomotive
- South African Class S 0-8-0, steam locomotives
See also
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This disambiguation page lists articles associated with the title Class S.
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