"I Know I'm Not Wrong" is a song by Fleetwood Mac from the 1979 double LP Tusk. It was recorded as the final song of side three of the LP on 19 September 1979, written by Lindsey Buckingham, whose sparser songwriting arrangements and the influence of punk rock and new wave were the leading creative force on it and other Tusk tracks. This was both the first and last song worked on for the Tusk album, and took almost a year to complete.