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Atom Heart Mother is the fifth studio album by the English progressive rock band Pink Floyd. It was released by Harvest on 2 October 1970 in the UK, and by Capitol on 10 October 1970 in the US. It was recorded at Abbey Road Studios in London, England, and was the band's first album to reach number 1 in the UK, while it reached number 55 in the US, eventually going gold there. A remastered CD was released in 1994 in the UK and the United States, and again in 2011. Ron Geesin, who had already influenced and collaborated with Roger Waters, contributed to the title track and received a then-rare outside songwriting credit.

The cover was designed by Hipgnosis, and was significant in that it was the first one to not feature the band's name on the cover, or contain any photographs of the band anywhere. This was a trend that would continue on subsequent covers throughout the 1970s and beyond.

Although it was commercially successful on release, the band, particularly Waters and David Gilmour, have expressed several negative opinions of the album in more recent years. Nevertheless, it remained popular enough for Gilmour to perform the title track with Geesin in 2008.

Pink Floyd started work on the album after completing their contributions to the soundtrack for the film Zabriskie Point in Rome, which had ended somewhat acrimoniously. They headed back to London in early 1970 for rehearsals. A number of out-takes from the Rome sessions were used to assemble new material during these rehearsals, though some of it, such as "The Violent Sequence", later to become "Us and Them", would not be used for some time.

The title track to Atom Heart Mother resulted from a number of instrumental figures the band had composed during these rehearsals, including the chord progression of the main theme, which guitarist David Gilmour had called "Theme from an Imaginary Western", and the earliest documented live performance was on 17 January 1970 at Hull University. The band felt that the live performances developed the piece into a manageable shape. Recording of the track commenced at Abbey Road Studios in London, and was somewhat cumbersome, as it was the first recording to use a new eight-track one-inch tape and EMI TG12345 transistorised mixing console (8 track 20 microphone inputs) in the studio, and, as a result, EMI insisted the band were not allowed to do any splicing of the tape to edit pieces together. Consequently, band members Roger Waters and Nick Mason had little choice but to play the bass and drums, respectively, for the entire 23 minute piece in one sitting. The other instruments the band played were overdubbed later. Mason recalled the final backing track's lack of precise timekeeping would cause problems later on.

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