"I'm Not Who I Was" is a song by contemporary Christian musician Brandon Heath, and was the lead single from his debut album Don't Get Comfortable (2006). It became a number 1 hit song on Christian radio in mid-2007, and was nominated for two GMA Dove Awards in 2007: "Song of the Year" and "Pop/Contemporary Recorded Song of the Year".

The song is about forgiveness, and according to Brandon Heath, was inspired by seeing an old photograph of someone he hadn't been in touch with for a while.

In 2008, the song was nominated for two Dove Awards: Song of the Year and Pop/Contemporary Recorded Song of the Year at the 39th GMA Dove Awards.

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