HMS Seahorse was a 44-gun Seringapatam-class fifth-rate frigate built for the Royal Navy during the 1820s, one of three ships of the Andromeda sub-class.

After completion in 1830, she was ordered to be converted into a steam-powered ship in 1845, but this did not happen for another decade.

The Andromeda sub-class was a slightly enlarged and improved version of the Druid sub-class, with a more powerful armament.

[2] The Andromeda sub-class was armed with twenty-six 18-pounder cannon on her gundeck, ten 32-pounder carronades and a pair of 68-pounder guns on her quarterdeck and four more 32-pounder carronades in the forecastle.

[3] Seahorse, the ninth ship of her name to serve in the Royal Navy,[4] was ordered on 9 January 1823, laid down in November 1826 at Pembroke Dockyard, Wales, and launched on 22 July 1830.