Antimachus (Ancient Greek: Ἀντίμαχος, romanized: Antímakhos, derived from ἀντί anti and μάχη makhe: "against battle") may refer to these persons in Greek mythology:

• Antimachus, the son of Hippodamas, son of the river Achelous and Aeolid Perimede.^[1]
• Antimachus, one of the sons of Aegyptus. He married the Danaid Mideia who murdered him on their wedding night.^[2]
• Antimachus, a Centaur. He attended the wedding of Pirithous and was slain by Caeneus.^[3]
• Antimachus, the Thespian son of Heracles and Nicippe,^[4] daughter of King Thespius of Thespiae.^[5] Antimachus and his 49 half-brothers were born of Thespius' daughters who were impregnated by Heracles in one night,^[6] for a week^[7] or in the course of 50 days^[8] while hunting for the Cithaeronian lion.^[9] Later on, the hero sent a message to Thespius to keep seven of these sons and send three of them in Thebes while the remaining forty, joined by Iolaus, were dispatched to the island of Sardinia to found a colony.^[10]
• Antimachus, one of the Heraclides. He was the son of Thrasyanor and father of Deiphontes.^[11]
• Antimachus, a Cretan warrior who came with Idomeneus to fight on the Greeks side in the Trojan war. He was one of the warriors hidden in the Trojan horse.^[12] He was killed by Aeneas.^[13]
• Antimachus, the Trojan father of Pisander, Hippolochus,^[14] Hippomachus,^[15] and Tisiphone.^[16] Bribed by Paris, he was against returning Helen to Menelaus.^[17]
• Antimachus, one of the Suitors of Penelope who came from Dulichium along with other 56 wooers.^[18] He, with the other suitors, was shot dead by Odysseus with the assistance of Eumaeus, Philoetius, and Telemachus.^[19]