Overkill may refer to:
- Overkill medal (Halo 2) - In Halo 2, get 25 kills without dying.
- Overkill medal - In Halo 3, Halo 3: ODST, Halo: Reach, and Halo 4, get 4 kills within 4 seconds of each other.
- Overkill (Halo 3 Achievement) - In Halo 3, get an Overkill medal in a Lone Wolves playlist.
- Overkill (Halo Wars 2 achievement) - An achievement in Halo Wars 2
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