| Official Name: | Djemna |
| Pushpin Map: | Tunisia |
| Pushpin Map Caption: | Location in Tunisia |
| Subdivision Type: | Country |
| Subdivision Name: | Tunisia |
| Subdivision Type1: | Governorate |
| Subdivision Name1: | Kebili Governorate |
| Subdivision Name2: | Kebili South |
| Leader Title1: | Mayor |
| Leader Name1: | Nizar Najah (Democratic Current) |
| Unit Pref: | Imperial |
| Population As Of: | 2004 |
| Population Total: | 6128 |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Timezone: | CET |
| Utc Offset: | 1 |
| Coordinates: | 33.5833°N 10°W |
Djemna (Arabic: جمنة ), also spelt Jemna, is a small town located in southern Tunisia. The town is part of the Kebili Governorate.
It is surrounded by the Tunisian Sahara. The city is known by its A'in (العين in Arabic) which is a source of healthy water.
Djemna is one of the biggest producers of dates or deglets in Tunisia.
Djemna contains one of the oldest libraries in Tunisia (located in the old mosque). Djemna also contains the south scientific center of the City of Sciences.
Only a little minority still live in the town. The majority live outside Tunisia (mainly France and Germany).