"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. However, 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 verses and loud choruses with layered, distorted guitar.

"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 the lead single from the album to be the opening track, "Cherub Rock", "Today" and its follow-up "Disarm" are credited in All Music Guide for popularizing the band and "sen[ding] [Siamese Dream] into the stratosphere." "Today" has been generally well-received by critics, and in an article about the song in Blender it was described 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."

"Today" was the first and final single of Melanie B from her second solo album. It was released on June 13, 2005. The song received little video and airplay. It only sold 4,000 copies, making it the lowest selling single of a Spice Girls member.

"Today" is a song Poe contributed to the soundtrack of the film Great Expectations. The song was released as a single in order to promote the film and soundtrack.

"Today" is a folk rock ballad written by Marty Balin and Paul Kantner from the band Jefferson Airplane. It first appeared on their breakthrough album, Surrealistic Pillow.