Patrocles (Greek: Πατροκλῆς) (active c. 312 – 270 BCE) was a Greek and specifically a Macedonian general and writer on geographical subjects. He served Seleucus and Antiochus for several decades. After exploring the Caspian Sea, Patrocles concluded that the Caspian was a gulf or inlet that could be entered from the Indian Ocean. The only information on his work (even the title is unknown) is documented in the work of Strabo. As a military officer, Patrocles was a skilled engineer, and at one point managed to defend Babylonia for Seleucus against Demetrius Poliorcetes by flooding the irrigation canals.