Lyle David Mays (November 27, 1953 – February 10, 2020) was an American jazz pianist, composer, and member of the Pat Metheny Group. Metheny and Mays composed and arranged nearly all of the group’s music, for which Mays won eleven Grammy Awards.

While growing up in rural Wisconsin, Mays had a lot of curiosity but had to learn many things all by himself due to a lack of available resources and information. He had four main interests: chess, mathematics, architecture, and music. His mother Doris played piano and organ, and his father Cecil, a truck driver, taught himself to play guitar by ear. His teacher allowed him to practice improvisation after the structured elements of the lesson were completed. At the age of nine, he played the organ at a family member’s wedding, and fourteen he began to play in church. During his senior year of high school, at summer national stage band camp in Normal, Illinois, he was introduced to jazz pianist Marian McPartland.

Bill Evans at the Montreux Jazz Festival and Filles de Kilimanjaro by Miles Davis (both recorded in 1968) were important influences. He attended the University of North Texas after transferring from the University of Wisconsin–Eau Claire. He composed and arranged for the One O’Clock Lab Band and was the composer and arranger for the Grammy Award-nominated album Lab 75.