| Official Name: | Sidi Aïch |
| Native Name: | سيدي عيش |
| Pushpin Map: | Tunisia |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Tunisia |
| Subdivision Type: | Country |
| Subdivision Name: | Tunisia |
| Subdivision Type1: | Governorate |
| Subdivision Name1: | Gafsa Governorate |
| Unit Pref: | Imperial |
| Population As Of: | 2004 |
| Population Total: | 8297 [1] |
| Population Blank1 Title: | Ethnicities |
| Population Blank1: | Arab |
| Population Blank2 Title: | Religions |
| Population Blank2: | Islam |
| Timezone: | CET |
| Utc Offset: | 1 |
| Coordinates: | 35.2297°N 9.1294°W |
| Postal Code Type: | Postal code |
| Postal Code: | 1250 |
Sidi Aïch (Arabic: سيدي عيش) is a small town, located at 35° 13′ 47″ N, 9° 07′ 46″ E in south-central Tunisia, it belongs to Gafsa Governorate and it is located in 29 km in the north of Gafsa.
This city was the birth place of Mohammed Gammoudi, athlete and first Olympic champion from Tunisia.
Ruins near the town have been tentatively identified with Gemellae, a Roman era civitas in the Roman Province of Byzacena.