"Who Am I" is a song recorded by Christian rock band Casting Crowns. Written by Mark Hall and produced by Mark A. Miller and Steven Curtis Chapman, it was released on February 22, 2004, as the second single from the band's 2003 self-titled debut album. A pop rock and adult contemporary ballad, the song is based around the piano and utilizes orchestral sounds. Lyrically, the song is centered on worshiping God. The song received positive reviews from music critics upon its release, with several regarding it as one of the best songs on their debut album.

"Who Am I" received the awards for Song of the Year and Pop/Contemporary Recorded Song of the Year at the 36th GMA Dove Awards, and it was also nominated for Worship Song of the Year. It achieved success on Christian radio, topping the Billboard Hot Christian Songs and Hot Christian AC charts as well as simultaneously peaking atop the Radio & Records Christian AC, Christian CHR, and INSPO charts. It has been certified Gold by the Recording Industry Association of America (RIAA), signifying sales of over 500,000 digital downloads. Casting Crowns has performed the song in concert as well as at special events, and re-recorded the song in 2013 for their acoustic album The Acoustic Sessions: Volume One.

According to Casting Crowns' lead singer Mark Hall, the idea for "Who Am I" came while he was driving home with his wife and children one night. Hall, who was having personal worship time during the drive, recounts that he wondered "Who am I to think I can just call up to God whenever I want, from the middle of nowhere, and expect Him to hear me?" Hall says "immediately I started thinking I'm a new creation, I'm more than a conqueror... I'm [also] grass, that is rises up and is gone in a day". In an interview, he commented that "me being a conqueror is true, but at the same time I need to understand that my life is a vapor, and me being able to even pray to [God] is because of what he's done for me". "Who Am I" was produced by Mark A. Miller and Steven Curtis Chapman. It was recorded at Glow In The Dark Studio in Decatur, Georgia and Zoo Studio in Franklin, Tennessee, and it was engineered by Matt Goldman and Sam Hewitt.

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