Numerous ships of the Royal Navy have borne the name HMS Seahorse, after the marine creature, the Seahorse:
HMS Seahorse (1626) was a ship captured in 1626 and last mentioned in 1635.
HMS Seahorse (1654) was a hoy captured in 1654 and sold in 1655.
HMS Seahorse (1694 fireship) was a 10-gun fireship purchased from the Dutch in 1694, later used as a water boat, and sunk as a foundation in 1698.
HMS Seahorse (1694) was a 24-gun sixth rate launched in 1694 and wrecked in 1704.
HMS Seahorse (1709) was a 14-gun sixth rate launched in 1709 and wrecked in 1711.
HMS Seahorse (1712) was a 20-gun sixth rate launched in 1712, rebuilt in 1727 and sold in 1748.
HMS Seahorse (1748) was a 24-gun sixth rate launched in 1748 and sold in 1784.
HMS Seahorse (1794) was a 38-gun fifth rate launched in 1794 and broken up in 1819.
HMS Seahorse (1830) was a 46-gun fifth rate launched in 1830. She was converted to a screw frigate in 1847, then a screw mortar vessel in 1856. She was renamed Lavinia and used as a coal hulk in 1870 and was sold in 1902.
HMS Seahorse (1880) was a small 670 ton twin screw special vessel used as a survey ship, launched in 1881 and sold for scrap in 1920.
HMS Seahorse (98S) was an S-class submarine launched in 1932 and sunk in 1940.
