| Atalanti Island (Attica) | |
| Native Name: | Νησίδα Αταλάντη |
| Native Name Lang: | el |
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| Coordinates: | 37.935°N 23.5725°W |
| Waterbody: | Saronic Gulf |
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| Country: | Greece |
| Country Area M2: | or |
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| Country1 Area M2: | or |
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Atalanti Island (Greek, Modern (1453-);: Νησίδα Αταλάντη|Nisída Atalánti) is an island off the western coast of Attica region, between Salamis Island and the port of Athens, Piraeus. Anciently, the island was called Atalanta or Atalante (Αταλάντη).