H40 may refer to:
- H-40 (Michigan county highway)
- H-40 (keelboat) a sailing yacht designed by Hans Groop
- H40 (Long Island bus)
- Glaucoma
- HMS Anthony (H40), a Royal Navy A-class destroyer
- Hoffmann H40, a German prototype sports plane
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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