Demetrius of Salamis was a Greek historian of the 3rd century BCE. His origin is recorded as Salamis, though whether this refers to the island near Athens or the city in Cyprus is unresolved. No other biographical details survive.

His only known work is On the Kings in Judaea, which is now lost and preserved only in fragments. Demetrius is a fragmentary Hellenistic historian whose significance derives from his work’s later reception. His history of Judaea was used by Alexander Polyhistor and, subsequently, by Eusebius of Caesarea in his Praeparatio Evangelica. This transmission establishes Demetrius as a source for later Greek and Roman scholarship on Eastern history.