Lee Mack Ritenour (born January 11, 1952) is an American jazz guitarist who has been active since the late 1960s.

Ritenour was born on January 11, 1952 in Los Angeles, California, United States. At the age of eight he started playing guitar and four years later decided on a career in music. When he was 16 he played on his first recording session with the Mamas & the Papas. He developed a love for jazz and was influenced by guitarist Wes Montgomery. At the age of 17 he worked with Lena Horne and Tony Bennett. He studied classical guitar at the University of Southern California. In 1979, he “was brought in to beef up” one of Pink Floyd’s The Wall‘s heaviest rock numbers, “Run Like Hell“. He played “uncredited rhythm guitar” on “One of My Turns“.As the 1980s began, Ritenour began to add stronger elements of pop to his music, beginning with Rit (1981). Rit became his only release to chart in Australia, peaking at number 98. “Is It You” with vocals by Eric Tagg reached No. 15 on the Billboard pop chart and No. 27 on the Soul chart. The track peaked at number fifteen on Hot Adult Contemporary chart. He continued with the pop-oriented music for Rit/2 (1982) and Banded Together (1984), while releasing a Direct-Disk instrumental album in 1983 called On the Line. He also provided rhythm guitar on Tom Browne‘s album Funkin’ for Jamaica. He recorded Harlequin (1985) with Dave Grusin and vocals by Ivan Lins. His next album, Earth Run, was nominated for a Grammy Award for Best Jazz Fusion Performance. The album’s title track was also Grammy nominated in the category of Best Instrumental Composition.Portrait (GRP, 1987) included guest performances by The Yellowjackets, Djavan, and Kenny G.