DH4 may refer to:
- Airco DH.4, British World War I two-seat biplane
- de Lackner HZ-1 Aerocycle, also known as the YHO-2 and DH-4 Heli-Vector (1950s)
- Bombardier Dash 8 Q400, turboprop passenger airliner (since 1996, called DH4 by various airlines)
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