Prospalta () was a deme of ancient Attica in the phyle Acamantis. It lay in the interior, between Zoster and Potamus.Demosthenes, c. Macart. p. 1071; Harpocr., s.v.; Phot., s.v.; Suda, s.v.;

Its site is located northwest of modern Kalyvia Thorikou.

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