"360" is a song by British singer Charli XCX. It was released on 10 May 2024 through Atlantic Records as the fourth single from her sixth studio album, Brat, wherein it was included as the opening track. Featuring minimalist electropop and hyperpop production by A. G. Cook and Cirkut and deadpan singing by Charli XCX, its boastful, tongue-in-cheek lyrics make references to her musical career, her reverence in the music industry, and her friends Julia Fox and Gabbriette. Its Aidan Zamiri-directed music video stars an ensemble cast of online "it girl" influencers, models, and actresses, including Fox, Gabbriette, Rachel Sennott, and Chloë Sevigny, and begins with a skit in which they meet at dinner to find a "new hot Internet girl".

"360" was critically lauded for its catchiness and memorable lyrical catchphrases—the latter of which, particularly "I'm so Julia", were the subjects of Internet memes, merchandising, and critical analysis—and nominated for the Grammy Award for Record of the Year. Its music video received similar praise, winning the UK Music Video Award for Video of the Year and earning nominations for an MTV Video Music Award, an MTV Europe Music Award, and the Grammy Award for Best Music Video. "360" peaked at number 11 on the UK Singles Chart and on the Irish Singles Chart and at number 41 on the Billboard Hot 100.

Charli XCX performed "360" live throughout her co-headlining tour with Troye Sivan, Sweat, and on her solo Brat Tour. She also performed it on an episode of Saturday Night Live that she hosted and during a surprise set in Times Square. It was remixed by Aminé and covered by Tourist and Blossoms, both for BBC Radio 1, while an official remix of "360" featuring Swedish singer Robyn and Swedish rapper Yung Lean was released on 31 May 2024. Critics commended it for Robyn's verses but some criticised it for its underutilisation of Robyn.

"360" was released through Atlantic Records on 10 May 2024. It was the second single from Charli XCX's sixth studio album, Brat, after "Von Dutch" and the album's fourth pre-release following the promotional single release for her songs "Club Classics" and "B2B". Brat was released on 7 June 2024, with "360" as its opening track.

Charli XCX premiered "360" during a pop-up event in early May 2024 in Greenpoint, Brooklyn, where she danced to the song on top of an SUV in front of a wall painted the same shade of green as Brat's cover art. It later became known as the "brat wall" and, in June 2024, was painted to read, "I'm your fav reference", a lyric from "360". T-shirts and keychains based on the lyrics of "360" were sold on Charli XCX's website starting in July 2024.

"360" is a hyperpop, synth-pop, electropop, dance-pop, and electroclash song. It was produced by Charli XCX's longtime collaborator A. G. Cook with Canadian record producer Cirkut and written by Charli XCX, Blake Slatkin, and Omer Fedi. Cook stated that the song was made "really quickly" due to Charli XCX having a clear vision for it. It has minimalist, synth-led production and Charli XCX rap-sings on it in a deadpan tone with slightly pitch-raised vocals. Written in common time in the key of C major, it runs for two minutes and 13 seconds at 120 beats per minute.

The lyrics to "360" revolve around themes of self-empowerment. Carrie Battan of The New Yorker described them as "an assemblage of vague ideas about glamour and celebrities that listeners can disappear into"; The Daily Beast's Coleman Spilde jokingly referred to the song as a "hot girl hymn" due to its focus on "the subject of hotness". The song opens with the lyric "I went my own way and I made it/I'm your favorite reference, baby", which Hannah Mylrea of NME detailed as Charli XCX expressing "self-confidence, celebration and the knowledge of the place [she] holds in the musical landscape" and which Laura Snapes of The Guardian called "indicative of her cult status" and her "wealth of lore". She describes herself as "666 with a princess streak", which Grace Robins-Somerville of Paste wrote typified the most common definition of a "brat" as "badly behaved" and "not afraid to cause a scene" and which Brittany Allen of Literary Hub joked was "invok[ing] the devil". She also "venomously" sings in another verse, "If you love it, if you hate it/I don't fucking care what you think". Spilde wrote that the lyric was Charli XCX's way of expressing that "she couldn't be more tired of critics conflating her ego-inflated persona with the quality of her music".

Its further lyrics reference several of Charli XCX's colleagues and friends: Cook ("You gon' jump if A. G. made it"); model Gabbriette ("Call me Gabbriette, you're so inspired")—the lead singer of the disbanded punk rock band Nasty Cherry, which Charli XCX formed for the Netflix docuseries I'm with the Band: Nasty Cherry, and fiancée to Matty Healy, who is bandmates in the 1975 with Charli XCX's fiancé George Daniel—and, in the song's chorus, actress Julia Fox ("I'm everywhere, I'm so Julia"), who rose to prominence for her role in the 2019 film Uncut Gems and her highly publicized relationship with Kanye West. In a 2023 interview with Fox, Charli XCX told her that the lyric "I'm so Julia" was "about how [Fox] started every trend of 2022".