"Cold Turkey" is a song written by John Lennon, released as a single in 1969 by the Plastic Ono Band on Apple Records, catalogue Apples 1001 in the United Kingdom, Apple 1813 in the United States. It is the second solo single issued by Lennon, and it peaked at number 30 on the Billboard Hot 100 and number 14 on the UK Singles Chart. The song's first appearance on an album was the 1975 compilation Shaved Fish.

"Cold turkey" describes the abrupt cessation of a substance dependence and the resulting unpleasant experience, as opposed to gradually easing the process through reduction over time or by using replacement medication.