Mário João Laginha dos Santos, OIH (born April 25, 1960 in Lisbon), a pianist and composer, is one of the most well-known Portuguese jazz musicians today. He is mostly recognized for his collaborations with Portuguese jazz singer Maria João, with whom he recorded over a dozen albums and toured worldwide extensively. Other acknowledged collaboration work includes four-handed piano sessions with Bernardo Sassetti and Pedro Burmester. Mário's main influence on piano is Keith Jarrett.