Onslaught may refer to:
- The weapon skill from Final Fantasy XI.
- The enemy ability from Final Fantasy XIII-2.
- The Dream Battles stage from A King's Tale: Final Fantasy XV.
- The skillset from Final Fantasy Tactics A2: Grimoire of the Rift.
- The Bravery Attack from Dissidia Final Fantasy.
- The track from Final Fantasy Brave Exvius.
Onslaught means a "violent attack".