HMS Orontes was a 19th-century troopship of the Royal Navy, intended for carrying troops to southern Africa and the West Indies (rather than to India like the Euphrates class of troopships such as Serapis).

[2] On 11 November 1871 she left Quebec, bringing the city's last imperial garrison back to Britain.

[1] While bound for Bermuda from Halifax, Nova Scotia, in 1878, a man fell overboard and the rescue party of fourteen men were lost when the rescue boat they were in capsized.

[3] In 1879 she brought the body of Louis Napoléon, Prince Imperial, killed earlier that year in the Zulu War, back to Britain.

She is notable in fiction as the troopship which brought Dr. John Watson back to Britain during his convalescence after the 1880 Battle of Maiwand, in the third paragraph of Chapter 1 of Arthur Conan Doyle's 1887 Sherlock Holmes work A Study in Scarlet.