A Momentary Lapse of Reason is the thirteenth studio album by the English progressive rock band Pink Floyd, released in the UK and US on 7 September 1987 by EMI and Columbia. It was recorded primarily on guitarist David Gilmour's converted houseboat, Astoria.
A Momentary Lapse of Reason was the first Pink Floyd album recorded without founding member Roger Waters, who departed in 1985. The production was marred by legal fights over the rights to the Pink Floyd name, which was not resolved until several months after release. It also saw the return of keyboardist and founding member Richard Wright, who had resigned from the band under pressure from Waters during the recording of The Wall (1979).