The Battle of the Granicus River in May 334 BCE is the first of three major battles fought between Alexander the Great and the Persian Empire.

Waged in Northwestern Asia Minor, near the site of Troy, it is here that Alexander defeats the forces of the Persian satraps of Asia Minor, including a large force of Greek mercenaries led by Memnon of Rhodes.The battle takes place on the road from Abydos to Dascylium (near modern day Ergili, Turkey), at the crossing of the Granicus River (modern day Biga Çayı).