Lonnie Smith (born July 3, 1942), styled Dr. Lonnie Smith, is an American jazz Hammond B3 organist who was a member of the George Bensonquartet in the 1960s. He recorded albums with saxophonist Lou Donaldson for Blue Note before being signed as a solo act. He owns the label Pilgrimage.

He was born in Lackawanna, New York, into a family with a vocal group and radio program. Smith says that his mother was a major influence on him musically, as she introduced him to gospel, classical, and jazz music. He was part of several vocal ensembles in the 1950s, including the Teen Kings which included Grover Washington Jr., on sax and his brother Daryl on drums. Art Kubera, the owner of a local music store, gave Smith his first organ, a Hammond B3.