Onslaught may refer to:

• Onslaught (comics), a Marvel Comics supervillain
• Onslaught (DC Comics), a DC Comics team of Quraci terrorists
• Onslaught (Magic: The Gathering), an expansion to the Magic: The Gathering collectible card game
• Onslaught (gametype), a gametype in the first-person shooter computer game Unreal Tournament 2004
• Onslaught (video game), a 1989 Amiga beat'em up computer game
• Onslaught (2009 video game), a 2009 Wii first-person shooter video game
• Onslaught (band), a British thrash metal band
• Onslaught (novel), a 2002 science fiction novel by David Sherman and Dan Cragg
• Onslaught (Transformers) is the leader of the Combaticons, a Decepticon team in the Transformers series
• A co-op mode in the video game Battlefield: Bad Company 2
• Onslaught (Dove), a short film/advertisement made by Dove for their Campaign for Real Beauty

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