"Who I Am Hates Who I've Been" is a song by the Christian rock band Relient K. It was released in June 2005 as the second single from their 2004 album Mmhmm. An acoustic version, originally recorded for Apathetic EP, is included on the B-side, was included on the 2008 The Bird and the Bee Sides album. The music video entered TRL's Top 10 in 2005, reaching as high as 8th on the countdown. "Who I Am Hates Who I've Been" was released to radio on August 23, 2005. The song reached No. 58 on the US Billboard Hot 100, making it their most successful single to date.

Matt Thiessen wrote the song in Australia in light of a feud with Brian Pittman, the band's bassist. The lyrics reflect remorse for his behavior, as well as pleas for forgiveness.

The music video for the song shows a woman encountering various events being rewound and replayed, interposed with scenes of Relient K performing on an urban rooftop. The video starts off with a view of a room and a young woman. The camera then pans out to see her step outside. The first series of event that happens is as follows; a grocer tosses her a random green fruit and she catches it, then she stops walking and realizes that everything else around her stopped too. She starts walking back and forth while watching an old woman drop and rewind her library books.

As the woman moves, her actions control everyone around her; an old man moving side to side with a TV, another young man on his cell phone and an Asian man crossing the street while preoccupied with reading a magazine. The young woman makes a mistake and takes too many steps and watches as she causes the Asian man to be hit by a Plymouth Reliant car. Shocked, she tries retracing her steps and starts back at where the grocer tosses her the fruit and takes a few steps to the side and starts walking again. Since it is not the same path as the first time, the events have changed. Instead of her catching the fruit, the man on the cell phone is instead, hit by it and he drops his phone. As he bends down to pick it up he accidentally kicks it into the path of a bicycle that has to swerve to miss him but instead nearly hits the old man with the TV and causes him to drop it.

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