"I Fell in Love with the Devil" is a song by Canadian singer Avril Lavigne and is the third track from her sixth studio album, Head Above Water. It was written by Lavigne and produced by Lavigne and Chris Baseford. The song is about a toxic relationship she maintained while suffering from Lyme disease. It was released as the fourth and final single from the album on June 28, 2019.
On February 7, Avril wrote about the song: "Sometimes your heart conflicts with your head and leads you into situations that you know aren’t right and then once you're there, it's very difficult to get out. I also produced this song with Chris Baseford." "I Fell in Love with the Devil" is about being in a toxic relationship and was announced as the fourth single and officially the second single from the album on June 7, 2019.