"Fantasy" is a song by American singer and songwriter Mariah Carey from her fifth studio album Daydream (1995), released in September 12, 1995 by Columbia Records as the lead single from Daydream. The song was written by Carey and Dave Hall, both serving as primary producers alongside Sean "P. Diddy" Combs. The song heavily samples Tom Tom Club's 1981 song "Genius of Love" and incorporates various other beats and grooves arranged by the former. The song's lyrics describe a woman who is in love with a man, and how every time she sees him she starts fantasizing about an impossible relationship with him. The remix for the song features rap verses from Ol' Dirty Bastard, something Carey arranged to assist in her transition into the hip-hop market.

The song was released to acclaim music critics, many of whom complimented its clever use of the "Genius of Love" hook as well as Carey's vocal performance. "Fantasy" experienced strong commercial success worldwide, especially in the United States. It became the second song in Billboard history, and the first by a female, to debut atop the Billboard Hot 100. Additionally, aside from topping the Hot 100 chart for eight consecutive weeks, the song top the charts in Australia, Canada and New Zealand, and was a top-five hit in Belgium, Finland, France and the United Kingdom.

Carey performed "Fantasy" live on several television and award show appearances around the world. Carey performed the song at the 23rd annual American Music Awards, held on January 29, 1996. Additionally, it was performed live on British music chart program Top of the Pops and on French television. "Fantasy" was part of the set-lists on several of Carey's succeeding tours, making its debut during the album's accompanying set of concerts, the Daydream World Tour and is featured on her compilation albums, #1's (1998), Greatest Hits (2001), The Remixes (2003) and Playlist: The Very Best of Mariah Carey (2010).

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