"Green Onions" is an instrumental composition recorded in 1962 by Booker T. & the M.G.'s. Described as "one of the most popular instrumental rock and soul songs ever" and as one of "the most popular R&B instrumentals of its era", the tune is a twelve-bar blues with a rippling Hammond M3 organ line by Booker T. Jones that he wrote when he was 17, although the actual recording was largely improvised in the studio.

Booker T. & the M.G.'s were an American instrumental R&B/funk band that was influential in shaping the sound of Southern soul and Memphis soul. The original members of the group were Booker T. Jones, Steve Cropper (guitar), Lewie Steinberg (bass), and Al Jackson Jr. (drums). In the 1960s, as members of the Mar-Keys, the rotating slate of musicians that served as the house band of Stax Records, they played on hundreds of recordings by artists including Wilson Pickett, Otis Redding, Bill Withers, Sam & Dave, Carla Thomas, Rufus Thomas, Johnnie Taylor and Albert King. They also released instrumental records under their own name, including the 1962 hit single "Green Onions". As originators of the unique Stax sound, the group was one of the most prolific, respected, and imitated of its era.