Isaac Lee Hayes Jr. (August 20, 1942 – August 10, 2008) was an American singer, songwriter, composer, and actor. He was one of the creative forces behind the Southern soul music label Stax Records in the 1960s, serving as an in-house songwriter with his partner David Porter, as well as a session musician and record producer. Hayes and Porter were inducted into the Songwriters Hall of Fame in 2005 in recognition of writing scores of songs for themselves, the duo Sam & Dave, Carla Thomas, and others. In 2002, Hayes was inducted into the Rock and Roll Hall of Fame.

During the late 1960s, Hayes also began a career as a recording artist. He released several successful soul albums such as Hot Buttered Soul (1969) and Black Moses (1971). In addition to his work in popular music, Hayes worked as a film composer.

Hayes wrote the musical score for the film Shaft (1971). For the "Theme from Shaft," he was awarded the Academy Award for Best Original Song in 1972, making him the third black person, after Hattie McDaniel and Sidney Poitier, to win an Academy Award in any competitive field covered by the Academy of Motion Picture Arts and Sciences. Hayes also won two Grammy Awards that same year. Later, he won his third Grammy for his album Black Moses.

In 1992, Hayes was crowned honorary king of the Ada region of Ghana in recognition of his humanitarian work there. He acted in films and television, such as in the movies Truck Turner (1974), Escape from New York (1981) and I'm Gonna Git You Sucka (1988), and as Gandolf "Gandy" Fitch in the TV series The Rockford Files (1974–1980). Hayes also voiced the character Chef in the Comedy Central animated series South Park from its debut in 1997 until his controversial departure in 2006.

On August 5, 2003, Hayes was honored as a BMI Icon at the 2003 BMI Urban Awards for his enduring influence on generations of musicians. Throughout his songwriting career, Hayes received five BMI R&B Awards, two BMI Pop Awards, two BMI Urban Awards and six Million-Air citations. As of 2008, his songs had generated more than 12 million performances.