"This I Promise You" is a ballad by American boy band NSYNC. It was released in September 2000 as the third and final single in the United States and the fourth and final single in Europe from their third studio album, No Strings Attached, in 2000. The song is included on all three of the band's compilation albums: Greatest Hits (2005), The Collection (2010), and The Essential *NSYNC (2014). The single reached number five on the US Billboard Hot 100 causing it to appear on the 2001 compilation album Now That's What I Call Music! 7.

NSYNC is an American vocal group and boy band formed by Chris Kirkpatrick in Orlando, Florida, in 1995 and launched in Germany by BMG Ariola Munich. The group consists of Kirkpatrick, Justin Timberlake, Joey Fatone, Lance Bass, and JC Chasez. Their self-titled debut album was successfully released to European countries in 1997, and later debuted in the U.S. market with the single "I Want You Back".