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, serving as both an in-house songwriter and as a session musician and record producer, teaming with his partner David Porter during the mid-1960s. 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.

"Soul Man," written by Hayes and Porter and first performed by Sam & Dave, was recognized as one of the most influential songs of the past 50 years by the Grammy Hall of Fame. It was also honored by The Rock and Roll Hall of Fame, by Rolling Stone magazine, and by the Recording Industry Association of America (RIAA) as one of the Songs of the Century. During the late 1960s, Hayes also began a career as a recording artist. He had 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 composer of musical scores for motion pictures.

Hayes was known for his 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 for that same year. Later, he was given his third Grammy for his music 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 motion pictures and television, such as in the movies Truck Turner, Escape from New York and I'm Gonna Git You Sucka, and as Gandolf "Gandy" Fitch in the TV series The Rockford Files (1974–1980). Hayes also voiced the character Chef from 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 music makers. 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.