Flashback(s) or Flash Back may refer to:
- Flashback (narrative), in literature and drama, a scene that takes the narrative back in time
- Flashback (psychology), in which a memory is suddenly and unexpectedly revisited
- Acid flashback, a reported psychological effect of LSD use
- Flashback (welding), a hazard of using an oxyacetylene torch
- Flashback arrestor, a safety device used in oxy-fuel welding and cutting