D78 may refer to:
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D. 78, Aria "Son fra l’onde" for soprano and piano, composed by Franz Schubert in 1813
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HMS Archer (D78)
HMS ''Archer'' was a built by the United States in 1939–1940 and operated by the Royal Navy during World War II. She was built as the cargo ship ''Mormacland'', but was converted to an escort carrier and renamed HMS ''Archer''. Her transmiss ...
, Long Island-class escort carrier built by the US in 1939–1940, operated by the Royal Navy during World War II
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HMS Vidette (D78), Admiralty V class destroyer of the Royal Navy
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HMS Wolverine (D78), Admiralty modified W class destroyer built for the Royal Navy
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London Underground D78 Stock
The London Underground D78 Stock, commonly referred to as D Stock, was a type of sub-surface rolling stock which operated on the District line of the London Underground, except on the Wimbledon station, Wimbledon to Edgware Road tube station (C ...
, type of sub-surface rolling stock which operated on the District line of the London Underground
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