"When You Believe" is an Academy Award-winning song composed by Stephen Schwartz for the DreamWorks animated feature The Prince of Egypt. A pop version of "When You Believe" was produced as a single with additional music by writer-producer Babyface for the film's soundtrack album. It was the main theme of the film and was released as a single by American singers Whitney Houston and Mariah Carey as the soundtrack's first single in 1998.

Due to the recording process, Houston and Carey, who had previously not really met, became friends. Although they have grown apart since then, at one point Houston even publicly declared Carey to be her closest friend.

In the film, this song of inspiration is performed by the characters Tzipporah (Michelle Pfeiffer) and Miriam (sung by Sally Dworsky). The protagonists of this ballad recall tough times that have them questioning their faith: they have prayed for many nights to God but those prayers seem to remain unanswered, and they wonder if they are wasting their time. Nevertheless, they realize that although times may be difficult, "there can be miracles when you believe" in God.