An anti-aircraft weapon is a weapon system designed to counter enemy aircraft, or, in some cases, low-flying spacecraft such as frigates. While human AA weapons most often rely on conventional bullets or missiles, Covenant anti-aircraft weapons are exclusively plasma-based.

Known AA weapons

UNSC

• Surface-to-air missiles
  • M19-B Surface-to-Air Missile Launcher - a man-portable surface-to-air missile launcher.
  • Anaconda Surface-to-Air Missile - a type of UNSC anti-air missile.
  • Surface-to-air missile launcher - a heavy UNSC SAM emplacement seen in Halo 3.
  • Unidentified UNSC missile battery - another type of SAM battery, seen in Halo: Reach.
• M71 Anti-Aircraft Gun - a Gatling-style AA gun emplacement featured in Halo: Reach.

Covenant

• Type-26 "anti-aircraft" Shade - Shade turrets with heavier armament and shielding are also used in anti-aircraft roles.
• Type-27 Mantis - An anti-air emplacement also called the "Mantis", featured in Halo 3.
• Type-38 Tyrant - A type of heavy AA cannon also known as the "Tyrant", featured in Halo: Reach.
• Type-56 Shrike - An anti-aircraft emplacement operated by associated intelligences.