HMS Hindostan (variously Hindustan or Hindoostan) was a 50-gun two-decker fourth rate of the Royal Navy.

She was originally a teak-built East Indiaman named Admiral Rainier launched at Calcutta in 1799 that the Royal Navy brought into service in May 1804.

Before the Royal Navy purchased her, Admiral Rainier made two trips to England for the British East India Company (EIC), as an "extra ship", i.e., under charter.

Captain William Lay left Calcutta on 28 December 1799, reached St Helena on 15 June 1800 and Falmouth on 2 September, and arrived at Deptford on 5 October.

Lay sailed Admiral Rainier to England for a second time, again under charter to the EIC, leaving Calcutta on 1 January 1803.

She passed Kedgeree on 1 February, reached St Helena on 16 July, and arrived at Gravesend on 27 September.

Macquarie's first task was to restore orderly, lawful government and discipline in the colony following the Rum Rebellion against Governor William Bligh.

[4] Hindostan shared with San Juan, Sabine, Lavinia, Hyacinth and Tuscan in the American droits for Phoenix, Margaret, Allegany and Tyger, captured on 8 August 1812 at Gibraltar on the arrival of the news of the outbreak of the War of 1812.

On 16 October 1829, she sprang a leak and sank at Chatham, Kent, with the loss of three lives,[11] but she was refloated, repaired, and returned to service.