HMS Boadicea was a 38-gun fifth-rate frigate of the Royal Navy. She served in the Channel and in the East Indies during which service she captured many prizes. She participated in one action for which the Admiralty awarded the Naval General Service Medal. She was broken up in 1858.

Boadicea was one of a batch of large frigates ordered in 1795, all of which were the largest of their type, and the majority of which were to the draught of captured French ships. She was built to the design of Imperieuse, a 40-gun ship completed in 1787 and captured in October 1793. Changes were made to the shape of the topsides, and the scantlings and fastenings were strengthened to reflect British practice. She retained her shallow French hull form, and as a result the holds and magazines were considered cramped.

Boadicea was commissioned under Captain Richard Keats for service in the Channel Fleet. Under Keats she served on this station for several years during which time she captured many prizes.

On 19 September 1797 Boadicea and Anson captured the French privateer brig Zephyr. She was out of Nantes, was armed with two brass 12-pounder guns and six 6-pounder guns, and had a crew of 70. She had not made any captures. The next day the two British vessels recaptured the ship Eliza, which was sailing under American colours. She had been sailing from London to the Cape of Good Hope with a cargo of merchandise when the French privateer Confiance had captured her. Then on the day after that, they recaptured the ship Jenny, of Greenock, which had been sailing from Liverpool to Virginia with a cargo of salt, earthenware and bale goods. The Jenny had fallen prey on 10 September, after a fight, to the privateer Hazard of Rochelle.

Then on 19 November 1797, Boadicea and Anson captured the privateer Railleur. She had a crew of 160 men and had been armed with 20 guns, but had thrown most of them overboard during the chase. She was one day out of Rochelle and had not taken any prizes. Nymph, Sylph and the hired armed cutter Dolly shared in the prize money. The same vessels shared in the recapture of several other vessels: Henniker, Active, Fanny, Mohawk, and Catherine. Around the 19th, Boadicea and Anson also recaptured a brig. Anson was running low on water and Keats sent her back into port.

Boadicea shared with Révolutionnaire, Pique, and the hired armed cutter Nimrod in the capture of Anna Christiana on 17 May 1798.

Around 18 June 1798 Boadicea captured the American ships Fanny and Lydia. On 9 December Boadicea captured Invincible Buonaparte, a French privateer of 20 guns (12 and 18-pounders) and 170 men. She was a new vessel, sixteen days out of Bordeaux and reportedly had not made any captures. However, a privateer by the same name had taken and burned the Friendship, Smith, master, which had been sailing from St Ube's to Falmouth. Boadicea sent Invincible Buonaparte, of "18 guns and 175 men" into Portsmouth. The Admiralty took Invincible Buonaparte into service as the 18-gun sloop Brazen. On the last day of the year, Boadicea recaptured the brig Adventure. The privateer Intrepid had captured Adventure, Warrington, master, as she was sailing from Tortola to London; Boadicea sent Adventure into Plymouth.

On 20 or 21 February 1799, Boadicea, Atalante, and Brilliant shared in the capture of the French privateer cutter Milan. She was armed with 14 guns and had a crew of 44 men. Keats ordered Atalante to take Milan into port, land the prisoners, and then rejoin Boadicea on station.