Admiral Sir Algernon Frederick Rous de Horsey KCB DL (25 July 1827 – 22 October 1922) was a Royal Navy officer, appointed aide-de-camp to Queen Victoria.

[3] His Admiralty report includes the remark, "One stranger, an American, has settled on the island – a doubtful acquisition."

This line inspired Mark Twain to write the short story The Great Revolution in Pitcairn (1879).

He frequently contributed letters to The Times and wrote An African Pilot and The Rule of the Road at Sea.

His son was Vice Admiral Victor Yorke de Horsey while his other daughter married Major William Croughton of the 3rd Dragoon Guards.