Atom Heart Mother

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

This was the first Pink Floyd album to be specially mixed for 4-channel quadraphonic sound as well as conventional 2-channel stereo. The SQ quadraphonic mix was released on LP in a matrix format compatible with standard stereo record players. There was also a release of the quadraphonic version in the UK in fully discrete 4-channel form on the "Quad-8" format, a 4-channel variant of the stereo 8-track tape cartridge.

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