Magnus IV may refer to:

• Magnus IV of Norway (ca. 1115–1139)
• Magnus IV of Orkney (ruled 1273–1284)
• Magnus IV of Sweden (1316–1374)

• Troitsko-Pechorsk Urban Settlement
• Troitsko-Zaozyornaya
• Troitsk, Sakha Republic
• Troitsk Settlement
• Troitsk Town Under Oblast Jurisdiction
• Troitsk Urban Okrug
• Troitsk, Ust-Maysky District, Sakha Republic
• Troitsky Administrative Okrug
• Troitsky District, Chelyabinsk Oblast
• Troitsky Okrug
• Troitsky Okrug (disambiguation)
• Troitsky, Russia
• Troitsky Urban Okrug
• Troizinia
• Troizinia-Methana
• Troiţa
• Troiţcoe
• Troja Bridge
• Trojaci
• Troja-Ljungby
• Trojan (1991 novel)
• Trojan 200
• Trojan 750
• Trojan camp
• Trojan (computer virus)