GEMA may refer to:
- Georgia Emergency Management Agency
- gema, a general purpose macro processor
- Gesellschaft für musikalische Aufführungs- und mechanische Vervielfältigungsrechte, or GEMA, a performance rights organisation in Germany
- The Gas and Electricity Markets Authority in the United Kingdom
- Global Engine Manufacturing Alliance, an engine-manufacturing joint venture between Chrysler, Hyundai Motors and Mitsubishi Motors
- Gema, a Di Gi Charat character
- Gikuyu, Embu, and Meru Association, a Kenyan organisation
- GEMA, the Gesellschaft für elektroakustische und mechanische Apparate, which produced radar equipment for the Kriegsmarine during World War II
- Gema, a Spanish given name meaning "gem"
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