Acid Rap is the second official mixtape by American rapper Chance the Rapper. It was released on April 30, 2013, as a free digital download. In July 2013, the album debuted at number 63 on the BillboardTop R&B/Hip-Hop Albums, due to bootleg downloads on iTunes and Amazon not affiliated with the artist. The mixtape has been certified "diamond" on mixtape site Datpiff, for garnering over 1,000,000 downloads.
Acid Rap was met with universal acclaim from music critics. At Metacritic, the mixtape received an average score of 86, based on 21 critics, which indicates "universal acclaim". It was also nominated for Best Mixtape at the 2013 BET Hip Hop Awards. The mixtape was ranked at number 2 on SPIN Magazine's list and number 26 on Rolling Stone's list of the 50 best albums of 2013, and first on their list of best mixtapes of 2013. It was the second most downloaded mixtape on MixtapeMonkey.com. It was also ranked at number 12 on Pitchfork's Top 50 Albums of 2013.