"I'm Lost Without You" is a song by American rock band Blink-182 and is the final track of the band's 2003 self-titled fifth studio album. The song, written by guitarist Tom DeLonge, bassist Mark Hoppus and drummer Travis Barker, lyrically relates to lost love. The track was worked on for over six months and features an extended outro that contains two dueling drum tracks mixed into each respective stereo channel.