Bonnaroo (or Bonnaroo Music and Arts Festival) is an American annual four-day music festival developed and founded by Superfly Presents and AC Entertainment.

Bonnaroo has taken place at what is now Great Stage Park, a 700-acre (280 ha) farm in Manchester, Tennessee, since it was founded in 2002. The festival typically starts on the second Thursday in June and lasts four days. Musical acts begin on Wednesday evening and end on Sunday night. Its multiple stages feature stylistically diverse music, including indie rock, classic rock, world music, hip hop, jazz, Americana, bluegrass, country music, folk, gospel, reggae, pop, electronic, and other alternative music.

The festival was ranked in 2003 by Rolling Stone magazine as one of the "50 Moments That Changed Rock & Roll", "Festival of the Decade" by Consequence of Sound, and among the 10 Best Festivals by GQ.

Ashley Capps, co-founder of AC Entertainment, developed Bonnaroo following the cancellation of the Hot Summer Nights rock music festival in Knoxville, Tennessee in 1999. Hot Summer Nights, which was a mainstay in Knoxville's World's Fair Park, suspended operations permanently following construction by city officials. Capps said: "The closing of the World's Fair Park for concerts precipitated getting creative and trying to find, 'OK, if we can't do this anymore, how can we still participate in the summer outdoor concert business,' and it was from that that Bonnaroo was ultimately launched." The festival was launched in 2002 by Capps, Superfly, manager Coran Capshaw and music agent Chip Hooper.

In 1999, the future site of Bonnaroo hosted the Itchycoo Park Festival (named after the song Itchycoo Park by Small Faces), considered the spiritual predecessor to Bonnaroo. Inspired by the 1974 Dr. John album Desitively Bonnaroo, the founders chose the name "Bonnaroo"—Creole slang for a really good time—for both its meaning and to honor New Orleans music.

In 2019, after a record-breaking festival sellout, it was announced that Live Nation was buying out Superfly's share of Bonnaroo.

The 2020 event was initially pushed back three months until September 2020, and ultimately cancelled because of health concerns surrounding the COVID-19 pandemic in the United States. The 2021 event was canceled due to torrential rainfall from Hurricane Ida saturating the stage area, campgrounds, and tollbooth area, and making ground conditions unsuitable for vehicle traffic. In 2025, the day after its Thursday night opening, the festival was cancelled due to severe weather.

Hulu has exclusively streamed the festival from 2022 to 2024, alongside Austin City Limits Music Festival and Lollapalooza.