Class S

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

• Type S (disambiguation)
• S class (disambiguation)
• S-Type (disambiguation)