D51 or D-51 may refer to:
- D-51, a Japanese popular music group
- JNR Class D51, a Japanese steam locomotive
- HMS Atheling (D51), a 1942 British Royal Navy escort aircraft carrier
- HMS Chevron (R51), a 1945 British Royal Navy destroyer, later re-designated D51
- D51 road (Croatia), a state road
- the ICD-10 code for vitamin B12 deficiency anemia
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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