"You Don't Know Anything" is a song by American indie rock band Ivy. It was released by Atlantic Records on April 29, 1999 as the fourth and final single from their second studio album, Apartment Life (1997). The single was made available exclusively in Europe and featured the same two B-sides as previous single, "This Is the Day", which had been released by 550 Music in Austria. The track was written by Dominique Durand, Adam Schlesinger and Andy Chase while production was handled by the latter two and Peter Nashel.

Released alongside "This Is the Day", "You Don't Know Anything" received promotion by Atlantic Records after the former track was included on the soundtrack for the 1998 film, There's Something About Mary. The recording received generally favorable reviews from music critics who compared the song to the works of Irish rock group My Bloody Valentine.

"You Don't Know Anything" was written by Ivy band members Dominique Durand, Adam Schlesinger and Andy Chase. The production of the track was handled by Chase and Schlesinger, with additional production provided by Peter Nashel. Musically, "You Don't Know Anything" is a pop rock/indie rock song, also incorporating elements of indie pop and guitar accords. Lyrically, the song discusses a lover being "clueless" and "in the wrong".

The single was heavily compared to My Bloody Valentine; in their review of the track, Sputnikmusic stated that it "comes off like a My Bloody Valentine song with intelligible vocals, with a sliding, reverb heavy hook and pummeling drums", while AllMusic writer Jack Rabid drew similar comparisons. Patrick Carmosino of West Net stated that with "You Don't Know Anything", Ivy "have an indie-ethic rock side that compliments their pop sensibilities to the tee".

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