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Alpha Halo may refer to:
- Installation 04 - The first Halo installation discovered by the UNSC. Destroyed by John-117 during the Battle of Installation 04 on September 22, 2552.
- Installation 08 - A replacement Halo installation created in response to the destruction of Installation 04. Destroyed by premature activation by John-117, Thel 'Vadam, and Avery Johnson during the Raid on Installation 08.
- Installation 09 - A second replacement Halo installation nicknamed "Anders' Halo." Disarmed by Ellen Anders in April 2559 and later intercepted by the Created while en route to the Soell system.