Ioannes IV (Ancient Greek: Ἰωάννης Δ΄, Iōannēs D΄) may refer to:

• Patriarch John IV of Constantinople (died in 595)
• John IV, Archbishop of Ohrid (c. 1088 – 1163/64)
• John IV Laskaris (1250–c. 1305)
• John IV Megas Komnenos (c. 1403–1459), emperor of Trebizond

• John IV (disambiguation)

Topics referred to by the same term

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