José Gil de Castro y Morales was an Afro-Peruvian portrait painter, cartographer and soldier who spent many years in Chile.

He was born in Lima; his parents were free citizens. His first studies were with Julián Jayo (?-1821) in Trujillo, while he was stationed there as an officer in the colonial militia. When he returned to Lima, he was apprenticed to José del Pozo.

Somewhere between 1805 and 1808, he moved to Chile, where he opened a studio and established his reputation as a portrait painter. He was familiarly known as "El Mulato Gil". In 1816, he was appointed Grand Master of the Guild of Painters. That same year, he enlisted in the Army of the Andes and was appointed an officer in the Corps of Engineers. He was placed in charge of making maps, a trade he had practiced earlier in Peru. In 1817, he was married in Santiago and became a Captain in the Rifle Battalion. He also built a house in the Barrio Lastarria and was named one of the first members of the Legion of Merit of Chile. His home and the surrounding grounds are now part of the Plaza Mulato Gil de Castro.

Thanks to his reputation as a portrait painter, he travelled extensively throughout Chile and Argentina, working on commissions from notable public figures. A distinguishing characteristic of his work is the text relating to his subject, placed on a banner, plaque or other device, that he included on many of his canvases. In 1820, he became a cartographer for the new Chilean government, but returned to Peru, probably in 1825, and was appointed an official government painter. One of his most notable portraits, and one of the few that doesn't depict a member of the upper classes, is the one of José Olaya, a fisherman who became a hero of the Peruvian War of Independence.

Although his birthdate can be ascertained from baptismal records, his date and place of death are unknown. Later sources, from the 1870s, say he died at the age of sixty-five, although his death has been placed from 1839 to 1850. The Chilean writer Antonio Gil Íñiguez [es], in his novel Cosa Mentale (A Mental Thing, 1992), attempts to recreate the painter's life, in a fantastical manner.