David Lee Marks (born August 22, 1948) is an American guitarist who was an early member of the Beach Boys. While growing up in Hawthorne, California, Marks was a neighborhood friend of the original band members and was a frequent participant at their family get-togethers.

Following his departure from the group, Marks fronted the Marksmen and performed and recorded as a session musician. Marks joined the Beach Boys in February 1962, replacing Al Jardine on rhythm guitar, and performed on the band's first four albums, Surfin' Safari (1962), Surfin' U.S.