Osiris Delgado Mercado (1920-2017) was a Puerto Rican artist and art historian. He is primarily known for his contributions to the history of Puerto Rican art, but he also taught in the Department of Fine Arts at the University of Puerto Rico. Delgado's artworks are held at various museums across the island, such as the Museo de Arte de Ponce, the Museo de Arte de Puerto Rico, the Institute of Puerto Rican Culture, and the University of Puerto Rico Museum of History, Anthropology and Art.