Diane Eve Warren (born September 7, 1956) is an American songwriter. She has won an Academy Honorary Award, Grammy Award, an Emmy Award, two Golden Globe Awards and three consecutive Billboard Music Awards for Songwriter of the Year from 1997 to 1999. She first gained recognition for her work on DeBarge's 1985 single "Rhythm of the Night". By the late 1980s, she joined the record label EMI, where she became the first songwriter in the history of Billboard magazine to have written seven hit songs, each recorded by different artists, prompting EMI's UK Chairman Peter Reichardt to call her "the most important songwriter in the world".

Warren has written nine number-one songs and 33 top-10 songs on the Billboard Hot 100 including "If I Could Turn Back Time" (Cher, 1989), "Look Away" (Chicago, 1988), "Because You Loved Me" (Celine Dion, 1996), "How Do I Live" (LeAnn Rimes, 1997), "When I See You Smile" (Bad English, 1989) and "I Don't Want to Miss a Thing" (Aerosmith, 1998). Two of the top 13 hits in the Hot 100's 57-year history were composed by Warren. She has been inducted into the Songwriters Hall of Fame and received a star on the Hollywood Walk of Fame. She has been rated the third most successful female artist in the UK, leading her to win the Ivor Novello Award and Special International Award in 2008. Warren has received 16 competitive Academy Award nominations without a win, tying with sound mixer Greg P. Russell for the most Oscar nominations without a single win. She received an honorary Oscar at the Governors Awards in November 2022.

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