"Lifesong" is a song recorded by Christian rock band Casting Crowns. Written by Mark Hall and produced by Mark A. Miller, it was released as the lead single from the band's 2005 album Lifesong. According to Mark Hall, the lead vocalist of Casting Crowns, "Lifesong" came out of what he found himself saying to students in his church's youth ministry. Compared to the work of rock band U2, the song lyrically points believers towards honoring God in all they do.

"Lifesong" received mostly positive reviews upon its release, with some critics praising the song's musical arrangement. The song was nominated for two awards at the 37th GMA Dove Awards and has been performed by Casting Crowns in concert. It was a hit on Christian radio, topping the Billboard Hot Christian Songs and Hot Christian AC charts as well as the Radio & Records Christian AC and Soft AC/Inspirational charts. It also peaked inside the top ten on the Radio & Records Christian CHR chart. It ranked at number twenty-one on the 2000s decade-end Hot Christian Songs chart and number twenty-seven on the decade-end Hot Christian AC chart.