The term Reactor may be referring to either of the following:
- UNSC Reactor - A building in Halo Wars.
- Reactor (level) - A campaign mission in Halo Wars.
- Forerunner Bonus Reactor - An extra reactor found on some Halo Wars multiplayer maps.
- Reactor (multiplayer map) - A multiplayer map in Halo Online.
- This is a disambiguation page—a navigational aid which lists other pages that might otherwise share the same or a similar title. If an article link referred you here, you might want to go back and fix it to point directly to the intended page.