伊豆国（日语：伊豆国〔伊豆國〕／いずのくに〔いづのくに〕 Izunokuni */?），日本古代的令制国之一，属东海道，又称豆州。伊豆国的领域大约包含现在静冈县东部的伊豆半岛及东京都所属的伊豆诸岛。
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