TetraCorp is a corporation in System Shock series that competes with TriOptimum Corporation.
- Tetra is four in both ancient (τέτταρες) and modern Greek (τέσσερα).
- In the outro of System Shock, the Hacker successfully breaks into TetraCorp's corporate network and discovers the blueprints of the Power Battle Armor. This armour eventually made its way into another LookingGlass Technologies video game, Terra Nova: Strike Force Centauri in 1996.
- In System Shock 2, TetraCorp is responsible for minority of technology and systems aboard the Von Braun and UNN Rickenbacker, such as keypads and other standardized controls for doors, hatches and elevators, as well as refrigerators and nacelle control computers.