Olívia Guedes Penteado (12 March 1872 – 9 June 1934) was a Brazilian art patron and philanthropist who established the Salón de Arte Moderna in São Paulo. She was a motivating force for the country's modernism movement. Penteado was a friend of key artists of this movement, such as Anita Malfatti, Tarsila do Amaral, and Heitor Villa-Lobos. Her niece, Yolanda Penteado, was also an art patron.