Giga is a Japanese adult game and visual novel brand used by TGL subsidiary Entergram. The Giga brand is used on both regular visual novels as well as games that feature mecha with action-oriented gameplay elements. One of its sub-brands, Baldrhead, has been used for several of these action-oriented visual novels. Aside from their visual novels, they are known for creating the Variable Geo fighting game series for PC9800, which was later ported to TurboGrafx-CD, PC, Super Famicom, Sega Saturn and PlayStation.

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On 22-11-2022 the company announced through their official page that they will end development and sale of products on 31-03-2023.