Juan Guillermo Moore Ruiz (27 February 1833 - 7 June 1880) was a British Peruvian navy officer.

A few months later, Captain Moore took a Peruvian Navy crew to the United States to bring the ironclad Atahualpa to Peru.

As such he directed the actions to recapture the monitor Huáscar which had been captured by Nicolás de Piérola and had rebelled against the central government.

[1] During the War of the Pacific between Chile and Peru, he was appointed commander of the strongest unit of the Peruvian Navy, the armoured frigate Independencia.

As such, he participated in the Battle of Punta Gruesa on 21 May 1879, when his ship crashed with a submarine rock while pursuing the Chilean schooner Covadonga, commanded by Captain Carlos Condell.