"Not Now John" is a song by the progressive rock band Pink Floyd, written by Roger Waters. It appears on the album The Final Cut (1983). The track is the only one on the album featuring the lead vocals of David Gilmour, found in the verses, with Roger Waters singing the refrains and interludes, and was the only single released from the album. It reached No. 30 in the UK Singles Chart.

Pink Floyd are an English rock band formed in London in 1965. Gaining an early following as one of the first British psychedelic groups, they were distinguished by their extended compositions, sonic experiments, philosophical lyrics and elaborate live shows. They became a leading band of the progressive rock genre, cited by some as the greatest progressive rock band of all time.