Henry "Harry" Peter Peglar (22 February 1812 – c. 1849) was an English seaman who served in the Royal Navy. He served as Captain of the Foretop, a Petty Officer rank, on HMS Terror during the 1845 Franklin Expedition, which sought to chart the Canadian Arctic, find the Northwest Passage, and make scientific observations. All expedition personnel died, including Peglar, mostly on and around King William Island. While Peglar's remains have not been identified, several of his personal effects were found with a skeleton by Francis Leopold McClintock, which constitute among the only written materials known to belong to members of the expedition. Earlier in his career, he engaged in anti-slavery operations in West Africa and served in the First Opium War.