Aristander of Telmessos (; born ca. 380 BCE, fl. 2nd half of 4th century BCE), a Greek from Caria, was Alexander the Great's favorite seer. Aristander was already in Philip's entourage in 357/6, when he correctly interpreted a dream as revealing Olympias' pregnancy. The ancient sources place him interpreting omens from the conqueror's birth to his death. Although details are variously given, and some incidents are fictitious, Aristander was clearly an influential presence during Alexander's campaigns, and played an important role in uplifting the morale of the Macedonian army. There are indications he wrote divinatory works, either before, during or after the expedition, although it is also possible these works were spuriously attributed.