"Man I Used to Be" is a 2005 top 20 hit single in Canada by Canadian alternative rapper k-os, featured as the third track on his 2004 album Joyful Rebellion.

The video begins with breakdancers in the hallway of an apartment building and k-os is in his room packing to leave, taking a box of seemingly great importance. k-os hails a taxi outside of the Hotel Waverly and two men fight a duel by dancing on the sidewalk. A bag man, pushing a cart with a neon light, sings the lyrics and k-os riding in the taxi, disappears by opening his box, which teleports him to the cockpit of a spacecraft in space. Footage of Maasai are seen on k-os's screen and the spacecraft enters warp drive.

The song peaked at #12 on the Canadian Billboard Hot 100, making it K-os's highest reaching single. The single also reached #1 on the Muchmusic Countdown in 2005. The song tells the story of a man who has gone through rough times and wishes to be back the way he was originally. According to the Joyful Rebellion liner notes, the song is indeed about Michael Jackson in particular, as well as k-os himself (and people in general).

In 2014, the track appeared on the French SNEP Charts.

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