Lee Rocker (born Leon Drucker, August 3, 1961, Massapequa, New York) is an American rockabilly double bass player. He was a member of the influential Rockabilly band The Stray Cats.
He is the son of the classical clarinetists Stanley Drucker (the retired principal clarinetist of the New York Philharmonic Orchestra) and Naomi Drucker. His sister Roseanne is a country music singer-songwriter. As a child, he played the cello, and later learned to play the electric bass.
Drucker's school friends included James McDonnell and Brian Setzer. The three of them played together regularly and widened their musical interests to include the blues and rockabilly. Drucker also learned to play the double bass to incorporate the sounds of blues and rockabilly on the acoustic instrument. The three of them formed the group The Stray Cats in 1979. McDonnell took on the stage name of "Slim Jim Phantom", and Drucker devised his own stage name of "Lee Rocker". Rocker evolved his own style of slap-bass playing with the group.