Erroll Louis Garner (June 15, 1921 – January 2, 1977) was an American jazz pianist and composer known for his swing playing and ballads. His best-known composition, the ballad "Misty", has become a jazz standard. Allmusic.com calls him "one of the most distinctive of all pianists" and a "brilliant virtuoso".

Born in Pittsburgh, Pennsylvania to an African American family in 1921 (though some sources say June 15th, 1923), Erroll began playing piano at the age of 3. He attended George Westinghouse High School, as did fellow pianists Billy Strayhorn and Ahmad Jamal. Garner was self-taught and remained an "ear player" all his life – he never learned to read music. At the age of 7, Garner began appearing on radio station KDKA in Pittsburgh with a group called the Candy Kids. By the age of 11, he was playing on the Allegheny riverboats. At age 14 in 1937, he joined local saxophonist Leroy Brown.

He played locally in the shadow of his older pianist brother Linton Garner and moved to New York in 1944. He briefly worked with the bassist Slam Stewart, and though not a bebop musician per se, in 1947 played with Charlie Parker on the famous "Cool Blues" session. Although his admission to the Pittsburgh music union was initially refused because of his inability to read music, they eventually relented in 1956 and made him an honorary member. Garner is credited with having a superb memory of music. After attending a concert by the Russian classical pianist Emil Gilels, Garner returned to his apartment and was able to play a large portion of the performed music by recall.