"Today" is a song by American alternative rock band The Smashing Pumpkins, written by lead vocalist and guitarist Billy Corgan. The song, though seemingly upbeat, contains dark lyrics. Corgan wrote the song about a day in which he was having suicidal thoughts, exemplified by the reference to self-mutilation in the chorus. The contrast between the grim subject matter of the song and the soft instrumental part during the verses, coupled with use of irony in the lyrics, left many listeners unaware of the song's tale of depression and desperation. The song alternates between quiet, dreamy verses and loud choruses with layered, distorted guitar similar to the noisy guitar rock of My Bloody Valentine.

"Today" was released in September 1993 as the second single from the band's second album and major label debut, Siamese Dream. Although Corgan opted for "Cherub Rock", the lead single from the album, to be the opening track, "Today" and its follow-up "Disarm" are credited in AllMusic for popularizing the band and "sen[ding] [Siamese Dream] into the stratosphere". "Today" has been generally well received by critics; a Blender article described it as having "achieved a remarkable status as one of the defining songs of its generation, perfectly mirroring the fractured alienation of American youth in the 1990s."

After the release and minor success of the band's debut album, Gish, The Smashing Pumpkins were being hyped as "the next Nirvana". However, the band was experiencing several difficulties at the time. Drummer Jimmy Chamberlin was undergoing an increasingly severe addiction to heroin; James Iha and D'arcy Wretzky had recently broken up their romantic relationship; and Billy Corgan had become overweight, depressed to the point of contemplating suicide, and plagued by writer's block. Corgan recalled that "after the first album, I became completely suicidal. It was an eight-month depression, give or take a month, and I was pretty suicidal for about two or three months." Under the pressure and other complications, the Pumpkins entered the Triclops Sound Studios in Atlanta to record the follow-up to Gish.

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