Monimus (; Greek, Ancient (to 1453);: Μόνιμος; fl. 4th century BC), son of Pythion, was a Macedonian officer who espoused the cause of Olympias in her final struggle with Cassander, and was one of the last who remained faithful to her; but finding himself unable to relieve her at Pydna, he withdrew to Pella, which city he held for a time, but surrendered it to Cassander after the fall of Pydna, 316 BC.[1] From an anecdote related by Phylarchus,[2] it appears that he had been attached to the court of Olympias for some time.