Fray Lorenzo de San Nicolás (1593–1679) was a Spanish architect. As he was a member of a religious order, he was known by the Spanish language title "fray" (a shortening of the word "fraile", used by friars and members of certain religious orders).
Born in Madrid, his double career as an architect and a friar began in his teens. He was influenced by his father who was also an architect and, in later life, an Augustinian friar.
- "Iglesia" (in Spanish). Retrieved 2018-02-03.