"Reasons to Be Cheerful, Part 3" is a song and single by Ian Dury and the Blockheads, initially released as the single "Reasons to be Cheerful, Part 3 / Common as Muck" issued on 20 July 1979 and reached number 3 in the UK Singles Chart the following month. It is the last single to be released by the band in their original line-up. Parts 1 and 2 do not exist.

Ian Robins Dury was an English singer, songwriter and actor who rose to fame in the late 1970s, during the punk and new wave era of rock music. He was the lead singer and lyricist of Ian Dury and the Blockheads and previously Kilburn and the High Roads.