| South Athens | |
| Name Local: | Περιφερειακή ενότητα Νοτίου Τομέα Αθηνών |
| Type: | regional unit |
| Caption Skyline: | Municipalities of South Athens |
| Coordinates: | 37.9°N 67°W |
| Periph: | Attica |
| Seat: | Kallithea |
| Area: | 69.4 |
| Population: | 529455 |
| Population As Of: | 2021 |
| Area Code: | 210 |
South Athens (Greek, Modern (1453-);: Νότιος Τομέας Αθηνών) is one of the regional units of Greece. It is part of the region of Attica. The regional unit covers the south-central part of the Athens agglomeration.
As a part of the 2011 Kallikratis government reform, the regional unit South Athens was created out of part of the former Athens Prefecture. It is subdivided into 8 municipalities. These are (number as in the map in the infobox):[1]