Flashback (disambiguation)
Flashback may refer to:

 , the Voyager episode
 Flashback (novel), the novelization of the Voyager episode
 Flashback (story device), the device of telling about back story
 Flashback, in which a person is (usually unexpectedly) revisited by elements of an experience

For the medical phenomena:
Hypnagogic regression, the medical condition causing "flashbacks" to be experienced

fr:Flashback