D37 or D-37 may refer to:
Ships
- Brazilian destroyer Rio Grande do Norte (D37), a Mato Grosso-class destroyer of the Brazilian Navy
- HMAS Tobruk (D37), a Battle-class destroyer of the Royal Australian Navy
- HMS Dasher (D37), an Avenger-class aircraft carrier of the Royal Navy
- HMS Duncan (D37), a Type 45 destroyer of the Royal Navy
- HMS Vortigern (D37), a V-Class destroyer of the Royal Navy
Rail transport
- EMD D37, a traction motor equipping the New South Wales 42 class locomotive
- PRR D37, a Pennsylvania Railroad locomotive
other uses
- ASTM D37, a testing standard for cannabis
- D-37C, the computer component of the all-inertial NS-17 Missile Guidance Set
- D37D, a Minuteman III intercontinental ballistic missile flight computer
- D37 road (Croatia)
- Queen's Gambit Declined, a chess opening
- Warren Municipal Airport (Minnesota)
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