R38 is a class of British airships, of which only one was completed.

R38 may also refer to: R-38 (missile), a Soviet prototype air-to-air missile R38 (New York City Subway car) R38 (South Africa), a road , a submarine of the Royal Navy , an aircraft carrier of the Royal Navy R38: Irritating to skin, a risk phrase Renard R.38, a Belgian aircraft Small nucleolar RNA R38 Tachikawa R-38, a Japanese training aircraft R38, a car design of London Underground R Stock trains