"John L" is a song by English rock band Black Midi, released in 2021 as the lead single from their second studio album, Cavalcade. The song describes the story of a powerful leader, the titular John L, who is eventually betrayed and killed by his followers. It was released on March 23, with the B-side Despair and a music video directed by Nina McNeely. A 12-inch release for the single was made available for pre-order on the same day and released on April 9.
The song is one of few on Cavalcade to have writing credits for guitarist Matt Kwasniewski-Kelvin, written before his departure from the band but recorded after.