| SEGA | Special Entertainment Games Association | 特殊娱乐游戏协会 |
| SEGA | Semi Educational Game Association | 半教育游戏协会 |
| SEGA | Southeast Glass Association | 东南玻璃协会 |
| SEGA | SErvice GAmes | S服务GAmes |
| SEGA | Scotch Entertainment Gaming America | 苏格兰娱乐博彩美国 |
| SEGA | Southeast Grand Am Owners Club | 东南大美洲车主俱乐部 |
| SEGA | Serbia Economic Growth Activity | 塞尔维亚经济增长活动 |
| SEGA | Subependymal Giant Cell Astrocytoma (brain tumor) | 室管膜下巨细胞星形细胞瘤（脑肿瘤） |