"I Believe My Heart" is a duet between Duncan James of English boy band Blue and British soprano Keedie Babb.

The song was James' first release as a solo artist, shortly before Blue went on hiatus.

The song was written by David Zippel (lyrics) and Andrew Lloyd Webber (music) for use in the Lloyd Webber musical The Woman in White, which premiered the same year.

Outside the UK, the song reached the top 20 in Italy and also charted in Belgium, Germany, Ireland, and Switzerland.

During the last section of the song, James and Keedie have found each other beneath a large oak tree.