Leon Konitz (October 13, 1927 – April 15, 2020) was an American composer and alto saxophonist.

He performed successfully in a wide range of jazz styles, including bebop, cool jazz, and avant-garde jazz. Konitz’s association with the cool jazz movement of the 1940s and 1950s includes participation in Miles Davis‘s Birth of the Cool sessions and his work with pianist Lennie Tristano. He was one of relatively few alto saxophonists of this era to retain a distinctive style, when Charlie Parker exerted a massive influence. Like other students of Tristano, Konitz improvised long, melodic lines with the rhythmic interest coming from odd accents, or odd note groupings suggestive of the imposition of one time signature over another. Other saxophonists were strongly influenced by Konitz, such as Paul Desmond and Art Pepper.

He died during the COVID-19 pandemic due to complications brought on by the disease.

Leon Konitz was born on October 13, 1927, in Chicago to Jewish parents of Austrian and Russian descent. At the age of eleven, Konitz received his first clarinet. However, he later dropped the instrument in favor of the tenor saxophone. He eventually moved from tenor to alto. His greatest influences at the time were the swing big bands he and his brother listened to on the radio; hearing Benny Goodman on the radio was what prodded him to ask for a clarinet. He improvised on the saxophone before learning to play standards.