"Believe" is a song recorded by American singer-actress Cher. It is the title track from her twenty-second album of the same name (1998), and was released as the lead single from the album on October 19, 1998 by Warner Bros. Records. It was written by Brian Higgins, Stuart McLennen, Paul Barry, Steven Torch, Matthew Gray and Timothy Powell, although Cher claimed later in a 2000 interview that she also wrote part, and was produced by Mark Taylor and Brian Rawling. A considerable departure from Cher's work at the time, "Believe" abandoned the singer's then pop rock-based repertoire in favor of being more club-friendly, in order to engage a younger audience.

"Believe" is an upbeat dance-pop song. The song is one of the first commercial recordings to feature the audio processor software Auto-Tune as a vocal effect, used to produce the prominent altered effect on Cher's vocals. This technique would eventually become known as the "Cher effect". Lyrically, the song is about the personal empowerment and self-sufficiency after a painful break-up. Critically, "Believe" has been met with appreciation ever since its release; reviewers have praised its production, catchiness and club-friendly nature, and listed it as one of the singer's career highlights. The song was also nominated for two Grammy Awards; for Record of the Year and Best Dance Recording, winning the latter.

Commercially, the song attained immense global success, reaching number one in almost every country it charted, including Australia, Canada, Ireland, New Zealand, the United Kingdom, Spain, France, Germany, Italy and the United States. It earned Cher a place in the Guinness Book of World Records as the oldest female solo artist to top the Billboard Hot 100 chart. It also became the highest-selling single by a solo female artist in the United Kingdom. "Believe" remains one of the best-selling singles of all time with sales of over 11 million copies worldwide.

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