What You Don't Know

What You Don't Know may refer to:
 * "What You Don't Know" (David Belbin novel), second in 'Bone and Cane' sequence
 * What You Don't Know (Exposé album)
 * "What You Don't Know" (Exposé song), its title track
 * What You Don't Know (Jon Randall album)
 * "What You Don't Know" (Monrose song)
 * "What You Don't Know", a song by Jonatha Brooke, the theme song for the TV series Dollhouse