"Why Don't We Fall in Love" is a song written and produced by Rich Harrison for American R&B singer Amerie's debut album, All I Have (2002). Released as the album's lead single in the United Kingdom in October 2001 and in the United States in July 2002 after being sent US Urban/Urban AC, Top 40 and Rhythmic radio in April 2002, the song reached number twenty-three on the Billboard Hot 100 and became a top ten hit on the Hot R&B/Hip-Hop Songs. It performed moderately elsewhere, peaking at number forty in the United Kingdom and number seventy-three in Australia. The song is also used for the promo of the CBS soap opera The Young and the Restless. It is also one of the songs used in the American version of Donkey Konga 2.

The single's music video was directed by Benny Boom and released in June 2002.

The official remix features rapper Ludacris and is in the CD single and the Japanese edition of the album, and there also a remix called the Roc-A-Fella Remix and features Dipset rapper Cam'Ron, and a remix also produced by Rich Harrison called the Richcraft Remix and has new verses by Amerie and a new instrumental and is in her next album as a bonus track for the U.S. and Japanese editions of the album.

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