Susa (Persian: شوش Shush [ʃuʃ]; Greek: Σοῦσα [ˈsuːsa]; Syriac: ܫܘܫ Shush; Old Persian Çūšā-; Biblical Hebrew שׁוּשָׁן Shushān) was an ancient city of the Elamite, Persian and Parthian empires of Iran. It is located in the lower Zagros Mountains about 250 km (160 mi) east of the Tigris River, between the Karkheh and Dez Rivers.

The modern Iranian town of Shush is located at the site of ancient Susa. Shush is the administrative capital of the Shush County of Iran's Khuzestan province. It had a population 64,960 in 2005.