Steven Lee "Luke" Lukather (born October 21, 1957) is an American guitarist, singer, songwriter, arranger and record producer, best known for his work with the rock band Toto. A prolific session musician, Lukather has recorded guitar tracks for more than 1,500 albums representing a broad array of artists and genres. He has also contributed to albums and hit singles as a songwriter, arranger and producer. Lukather has released seven solo albums, the latest of which was released in January 2013.

In 1976, when Lukather was nineteen years old, he was invited by his high school friends David Paich and the Porcaro brothers Steve and Jeff to join them in forming their band, Toto. He remained a member until the band split up in 2008, and has been involved in their periodic reunion tours. Lukather's reputation as a guitarist and his association with Paich and Jeff Porcaro, who also became established artists, allowed him to secure a solid flow of session work in the 1970s and 1980s. Lukather has been nominated for twelve Grammy awards, and has won five. While his work with Toto was predominantly based on pop rock music and his solo work ventures into progressive rock and hard rock, many of Lukather's side-projects are focused on jazz fusion. He held a long-time collaboration with jazz guitarist Larry Carlton that produced a Grammy-winning live album, and he was a member of the jazz fusion band Los Lobotomys, a collaboration of notable session musicians.