| Gaddi | chimpanzee | male | POTA: Force | inhabitant of Ape City, cadet at military academy, classmate of Attar | |
| Galen | chimpanzee | male | POTA TV | McDowall, Roddy | inhabitant of Central City, son of Ann and Yalu; seeks job from Councillor Zaius; takes interest in astronauts and kills prison guard; fellow fugitive of Alan Virdon and Peter Burke |
| Ganji, Professor | baboon | male | POTA: Resistance | "small, wizened baboon", teaches humans to read diagrams for construction of new Temple of Semos | |
| Glaucos | chimpanzee | male | POTA: Colony | son of Aspasia, twin brother of Glyppos; inhabitant of New Hope | |
| Glyppos | chimpanzee | male | POTA: Colony | son of Aspasia, twin brother of Glaucos; inhabitant of New Hope | |
| Grunt | gorilla | male | POTA (Adventure Comics) | mute son of Gen. Ollo | |
| Guzo | Return to the POTA Ep. 6 "Terror On Ice Mountain" | referred to in oath used by Capt. Jemmo, "What in Great Guzo's name is it?", on seeing Cornelius' air balloon |