Magnes may refer to:

• Magnes (son of Aeolus), in Greek mythology, the eponym and first king of Magnesia
• Magnes (son of Argos), in Greek mythology, son of Argos and Perimele, and father of Hymenaeus
• Magnes the shepherd, possibly mythological, cited as the discoverer of natural magnetism
• Magnes (comic poet) (5th century BC), Athenian victor of the Dionysia festival
• Macarius Magnes (4th century), bishop of Magnesia
• Judah Leon Magnes (1877–1948), reform rabbi in the United States and Palestine, first president of the Hebrew University of Jerusalem
• Magnes (album), by Reni Jusis

• Magnes (mythology)
• Magness (disambiguation)
• Magnus (disambiguation)