"You Know You're Right" is a song by the American rock band Nirvana, written by lead vocalist and guitarist, Kurt Cobain. It is the first song on the greatest hits album Nirvana, released by DGC Records in October 2002. It is also the final song the band recorded before Cobain's suicide in April 1994.

For years after Cobain's death, the song was known only from a bootlegged live version, recorded in October 1993 at the Aragon Ballroom in Chicago, Illinois, and from a cover by American rock band Hole, fronted by Cobain's widow, Courtney Love. Surviving Nirvana members Dave Grohl and Krist Novoselic had intended to release the studio version on a posthumous Nirvana box set, but Love blocked its release in 2001, asserting that a recording of such "extraordinary artistic and commercial value" belonged on a cheaper, single disc compilation instead.

In September 2002, "You Know You're Right" was subject to a high profile Internet leak, which led to it being put into heavy rotation on radio stations around the world, despite cease and desist orders from Nirvana's record company, Geffen Records. Shortly after, it was announced that the lawsuit between Love and Grohl and Novoselic was settled, and that the song would appear on a greatest hits album later that year.

"You know You're Right" was released as a promo single in October 2002, and reached number one on both Billboard's Mainstream Rock Tracks and Modern Rock Tracks charts.