Juan de Velasco y Pérez Petroche (1727–1792) was an 18th-century Jesuit priest, historian, and professor of philosophy and theology from the Royal Audience of Quito.

Among the universities where he taught was the Universidad de San Marcos in Lima in the Viceroyalty of Peru.

He is best known for his history book Historia del Reino de Quito, although he also wrote books in fields other than history, such as physics textbooks and poetry anthologies.

The book is mentioned, discussed and criticized by several historians such as Marcos Jiménez de la Espada, Federico González Suárez, Jacinto Jijón y Caamaño, Alfredo Pareja Diezcanseco, Misael Acosta Solís, Enrique Ayala Mora and Galo Ramón Valarezo.

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