"You Don't Know" is a song by American band Berlin, which was released in 1986 as the third single from their fourth studio album Count Three & Pray.

[7] Recalling the initial recording of Count Three & Pray, Nunn said in a 2014 interview for Pop Entertainment: "It was so bad with this guy in England that we trashed the whole thing.

[9] Upon release, Cash Box commented: "A cool, atmospheric treatment shows the musical growth of former synth-pop pioneers.

The haunting melody and non-conforming arrangement form a bracing contrast to Terri Nunn's sultry, passionate vocal.

"[10] Vici MacDonald of Smash Hits described the song as "really quite good" and added: "A screechy guitar and a wailsome woman echo distantly over a foreboding, rolling drumbeat and the whole thing's massive, mysterious and foggy".