The Smashing Pumpkins (also simply known as Smashing Pumpkins) are an American alternative rock band formed in Chicago in 1988 by frontman and guitarist Billy Corgan, guitarist James Iha, bassist D'arcy Wretzky and drummer Jimmy Chamberlin. The band has undergone several line-up changes since their reunion in 2006, with Corgan being the primary songwriter and sole constant member since its inception. The current lineup consists of Corgan, Iha, and Chamberlin. The band is known for its diverse, densely layered sound, which evolved throughout their career and has integrated elements of gothic rock, heavy metal, grunge, psychedelic rock, progressive rock, shoegaze, dream pop, and electronica.

The band's debut album, Gish (1991), was well-received by critics and became an underground success. In the advent of alternative rock's mainstream breakthrough, their second album, Siamese Dream (1993), established the band's popularity. Despite a tumultuous recording process, the album received widespread acclaim and has been lauded as one of the best albums in the genre. Their third album, Mellon Collie and the Infinite Sadness (1995), furthered the band's popularity; it debuted atop the Billboard 200, received a Diamond certification from the Recording Industry Association of America (RIAA), and continued the band's critical success. After the release of Adore (1998) and a two-part project in 2000—Machina and Machina II—the group disbanded due to internal conflicts, drug use, and diminishing sales by the end of the 1990s. With 30 million albums sold worldwide, the Smashing Pumpkins were among the most critically and commercially successful bands of the 1990s, and an important act in the popularization of alternative rock.

In 2006, Corgan and Chamberlin reconvened to record the band's seventh album, Zeitgeist. After touring throughout 2007 and 2008 with a lineup including new guitarist Jeff Schroeder, Chamberlin left the band in early 2009. Later that year, Corgan began a new recording series with a rotating lineup of musicians entitled Teargarden by Kaleidyscope, which encompassed stand-alone singles, EP releases, and two full albums that also fell under the project's scope—Oceania in 2012 and Monuments to an Elegy in 2014. Chamberlin became a touring member in 2015, before officially rejoining with Iha in 2018. The reunited lineup then released the albums Shiny and Oh So Bright, Vol. 1 / LP: No Past. No Future. No Sun. (2018) and Cyr (2020), in addition to Atum: A Rock Opera in Three Acts across three increments between 2022 and 2023. Schroeder departed from the band in October 2023. Following Schroeder's departure, the band's remaining members released Aghori Mhori Mei (2024).

After the breakup of his gothic rock and metal band the Marked, singer and guitarist Billy Corgan left St. Petersburg, Florida and returned to his native city of Chicago, where he took a job in a record store and had the idea to start a band called the Smashing Pumpkins. While working at the store he met guitarist James Iha. Adorning themselves with paisley and other psychedelic trappings, the two began writing songs (with the aid of a drum machine) which were heavily influenced by the Cure and New Order. The duo performed live for the first time on July 9, 1988, at the Polish bar Chicago 21. This performance included only Corgan on bass and Iha on guitar with a drum machine. Shortly thereafter, Corgan met D'arcy Wretzky after a show by the Dan Reed Network where they argued the merits of a band. After finding out that Wretzky played bass guitar, Corgan got her to join the band and the trio played a show at the Avalon Nightclub. After the show, Cabaret Metro owner Joe Shanahan agreed to book the band on the condition that they replace the drum machine with a live drummer.

Jazz drummer Jimmy Chamberlin was recommended by a friend of Corgan's. Chamberlin knew little of alternative music and immediately changed the sound of the nascent band. As Corgan recalled of the period, "We were completely into the sad-rock, Cure kind of thing. It took about two or three practices before I realized that the power in his playing was something that enabled us to rock harder than we could ever have imagined." On October 5, 1988, the complete band took the stage for the first time at the Cabaret Metro.

In 1989, the Smashing Pumpkins made their first appearance on record with the compilation album Light Into Dark, which featured several Chicago alternative bands. The group released its first single, "I Am One", in 1990 on the local Chicago label Limited Potential. The single sold out and they released a follow-up, "Tristessa", on Sub Pop; then they signed to Caroline Records. The band recorded their 1991 debut studio album Gish with producer Butch Vig at his Smart Studios in Madison, Wisconsin, for $20,000. In order to gain the consistency he desired, Corgan often played all instruments excluding drums, which created tension in the band. The music fused heavy metal guitars, psychedelia, and dream pop, garnering them comparisons to Jane's Addiction. Gish became a minor success, with the single "Rhinoceros" receiving some airplay on modern rock radio. After releasing the Lull EP in October 1991 on Caroline Records, the band formally signed with Virgin Records, which was affiliated with Caroline. The band supported the album with a tour that included opening for bands such as the Red Hot Chili Peppers, Jane's Addiction, and Guns N' Roses. During the tour, Iha and Wretzky went through a messy breakup, Chamberlin became addicted to narcotics and alcohol, and Corgan entered a deep depression, writing some songs for the upcoming album in the parking garage where he lived at the time.

With the breakthrough of alternative rock into the American mainstream due to the popularity of grunge bands such as Nirvana and Pearl Jam, the Smashing Pumpkins were poised for major commercial success. At this time, the Smashing Pumpkins were routinely lumped in with the grunge movement, with Corgan protesting, "We've graduated now from 'the next Jane's Addiction' to 'the next Nirvana', now we're 'the next Pearl Jam'."

Amid this environment of intense internal pressure for the band to break through to widespread popularity, the band relocated to Marietta, Georgia, in late 1992 to begin work on their second album, with Butch Vig returning as producer. The decision to record so far away from their hometown was motivated partly by the band's desire to avoid friends and distractions during the recording, but largely as a desperate attempt to cut Chamberlin off from his known drug connections. The recording environment for Siamese Dream was quickly marred by discord within the band. As was the case with Gish, Corgan and Vig decided that Corgan should play nearly all of the guitar and bass parts on the album, contributing to an air of resentment. The contemporary music press began to portray Corgan as a tyrant. Corgan's depression, meanwhile, had deepened to the point where he contemplated suicide, and he compensated by practically living in the studio. Meanwhile, Chamberlin quickly managed to find new connections and was often absent without any contact for days at a time. In all, it took over four months to complete the record, with the budget exceeding $250,000.