"You Tell Me Why" is a song by American rock group The Beau Brummels, from the band's second album, The Beau Brummels, Volume 2. The song was written by guitarist Ron Elliott and produced by Sylvester Stewart, later known as Sly Stone. "You Tell Me Why" was released as the album's lead single, and peaked at number 38 on the Billboard Hot 100 in August 1965. The band revisited the song and included it on their 1975 eponymous album. The original version later appeared on the band's 1987 compilation album The Best of The Beau Brummels 1964–1968.

Released in the summer of 1965, "You Tell Me Why" was the Beau Brummels' third and final U.S. top 40 hit, reaching number 38 in August. The song peaked at number eight in Canada, making it the third consecutive single by the band to reach the top 10 on the Canadian Singles Chart.

The song was written by Ron Elliott and produced by Sylvester Stewart, later known as Sly Stone, although his involvement, according to Elliott and lead vocalist Sal Valentino, had diminished to the point the band does not recall any producer being in charge.SF Weekly journalist Justin F. Farrar said the song was "so prescient of the lush, melancholic vibe of early Jefferson Airplane that Marty Balin must have been digging it."Allmusic writer Matthew Greenwald called it one of the band's "finest early ballads."

The single's B-side, "I Want You," was also written by Elliott. Music critic and author Richie Unterberger said it was "as good as any song the Beau Brummels ever did, with its dense humming harmonies and spellbinding melody.

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