At Fillmore East is the first live album by American rock band the Allman Brothers Band, and their third release overall. Produced by Tom Dowd, the album was released in July 1971 in the United States by Capricorn Records. As the title indicates, the recording took place at the New York City music venue Fillmore East, which was run by concert promoter Bill Graham. It was recorded over the course of three nights in March 1971 and features the band performing extended jam versions of songs such as "Whipping Post", "You Don't Love Me" and "In Memory of Elizabeth Reed." When first commercially released, it was issued as a double LP with just seven songs comprising four vinyl sides.

At Fillmore East was the band's artistic and commercial breakthrough, and has been considered by some critics to be one of the greatest live albums in rock music. It has also been ranked among the best overall albums by artists and continues to be a top seller in the band's catalog, becoming their first album to go platinum. In 2004, the album was selected for preservation in the Library of Congress, deemed to be "culturally, historically, or aesthetically important" by the National Recording Registry.

Shortly after completing recording of their second album, Idlewild South (1970), band leader Duane Allman was contacted by guitarist Eric Clapton to contribute to his new project, Derek and the Dominos. Allman was a huge fan of his work with Cream, and Clapton had been blown away by Allman's session work on Wilson Pickett's "Hey Jude" some years prior. They met after a show one night in Miami and jammed together until the next afternoon, with the two guitarists regarding one another as "instant soulmates." Clapton invited Duane to join Derek and the Dominos, and according to band biographer Alan Paul he considered it; in the end, he declined and rejoined the Allman Brothers Band, returning after missing a string of several shows. The sessions were collected on Layla and Other Assorted Love Songs, issued that November.

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