The term Reactor may be referring to either of the following:
- UNSC reactor - A building in Halo Wars.
- Reactor - A campaign level in Halo Wars.
- Reactor - A multiplayer map in Halo Online
- Forerunner secondary reactor - An extra reactor found on some Halo Wars multiplayer maps.
- Fusion reactor - A reactor using nuclear fusion for power generation.
- Pinch fusion reactor - A fusion reactor used by the Covenant.
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