HMS Hesper was a Royal Navy 18-gun ship-sloop of the Cormorant class, launched in 1809 at Dartmouth. Her original builder, Benjamin Tanner, became bankrupt during her construction, so John Cock completed her. In 1810 she was reclassed as a 20-gun sixth rate ship (but without being re-armed); in 1817 she was again re-rated, this time as 26 guns. She served primarily in the Indian Ocean. In 1810 she participated in the Invasion of Isle de France. The next year Hesper participated in the capture of Java, which she followed in 1812 by capturing Timor. She was sold in 1817.