Plasma cannon may refer to the following:
- Type-26 Anti-Infantry Stationary Gun - The main Covenant stationary defense plasma turret commonly known as the Shade.
- Type-42 Directed Energy Support Weapon - A Covenant heavy support weapon seen exclusively in Halo 2.
- Type-52 Directed Energy Support Weapon - The Covenant's standard portable plasma turret in Halo 3, Halo 3: ODST, Halo: Reach, and Halo 4.
- Class-2 Energy Gun, weapons mounted on many Covenant vehicles.
- Plasma turret (starship) - The powerful plasma turret on Covenant warships.
- Heavy Plasma Turret - the defense structure used to protect the Covenant citadel as seen in Halo Wars.
- Automated Plasma Turret - Seen in the Halo 3 multiplayer map, Snowbound, to prevent players from exiting the combat area.
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