"J'en ai marre!" (English: "I'm fed up!") is a song performed by French singer Alizée, written by Mylène Farmer. Released in February 2003, the song is Alizée's fifth single as the lead artist, and was the first song from her second studio album Mes Courants Électriques. It charted at #4 in France and # 2 in Japan.

The release included the single version of the song followed by an instrumental version. Later on three remixes were made available in special editions of the single. Internationally, it was released as "I'm Fed Up!". In Japan, it was released as "Mon bain de mousse" ("My Foam Bath") along with a music video and a remix version of the song.