Six ships of the Royal Navy have borne the name HMS Acorn. A seventh was planned but never completed:
was a 22-gun ship hired between 1649 and 1654. was an 18-gun Cormorant-class ship-sloop launched in 1807 and broken up in 1819. was an 18-gun sloop launched in 1826 and wrecked in 1828. HMS Acorn was to have been an 18-gun sloop, but the order was cancelled in 1831. was a 12-gun brig launched in 1838. She was used as a coal hulk from 1861 and was sold in 1869. was a composite screw sloop launched in 1884 and sold in 1899. was an launched on 1 July 1910 and sold in 1921.
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