Lethe

Lethe may refer to:
 * Lethe flower, the source of the drug Synaptrol. (PROSE: Shada)
 * Lethe (The Juggernauts), a planet visited by Davros. (AUDIO: The Juggernauts)
 * Lethe (The Parliament of Rats), an ocean planet visited by the Fifth Doctor. (PROSE: The Parliament of Rats)
 * Lethe, a river on Gallifrey. (AUDIO: Master)