B34 may refer to:
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Avia B-34, a biplane fighter aircraft built in Czechoslovakia in the early 1930s
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Sicilian Defence, Accelerated Dragon, Encyclopaedia of Chess Openings code
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Lockheed Ventura B-34 Lexington
The Lockheed Ventura is a twin-engine medium bomber and patrol bomber of World War II.
The Ventura first entered combat in Europe as a bomber with the RAF in late 1942. Designated PV-1 by the United States Navy (US Navy), it entered combat in ...
, a bomber and patrol aircraft of World War II, used by United States and British Commonwealth forces
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Unterseeboot B-34, a German Type UB II submarine of the German Imperial Navy during World War I
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