John or Ivan Asen may refer to:
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Ivan Asen I (1186–1196), ruler of Bulgaria
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Ivan Asen II
Ivan Asen II, also known as John Asen II (, ; 1190s – May/June 1241), was Emperor (Tsar) of Second Bulgarian Empire, Bulgaria from 1218 to 1241. He was still a child when his father Ivan Asen I of Bulgaria, Ivan Asen I one of the founders of th ...
(1218–1241), ruler of Bulgaria
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Ivan Asen III (1279–1280), ruler of Bulgaria
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John Komnenos Asen, ruler of Valona
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John Doukas Angelos Palaiologos Raoul Laskaris Tornikes Philanthropenos Asen, 14th or 15th-century Byzantine noble child
{{hndis, Asen, Ivan