"I'm Losing You" is a song written by John Lennon and released on his 1980 album Double Fantasy. It was written in Bermuda in June 1980, after several attempts by Lennon to call his wife, Yoko Ono, who remained in New York. The song is also available on the 1982 compilation The John Lennon Collection, the 1998 boxset John Lennon Anthology, the one disc compilation Wonsaponatime, the 2005 two disc compilation Working Class Hero: The Definitive Lennon and in 2010 for the Gimme Some Truth album. The song was also featured in the 2005 musical Lennon.

Double Fantasy is the fifth studio album by John Lennon and Yoko Ono, and the final one to feature Lennon before his death. Released in November 1980 on Geffen Records, the album marked Lennon's return to recording music full-time, following his five-year hiatus to raise his son Sean. Recording sessions took place at the Hit Factory in New York City between August and October 1980. The final album features songs from both Lennon and Ono, largely alternating between the two in its track listing. Other tracks recorded by Lennon from the sessions were compiled by Ono for release on Milk and Honey in 1984.