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丰岛郡（日语：豊島郡〔豐島郡〕／としまぐん Toshima gun */?）为过去日本武藏国辖下的郡，辖区包含现在东京都千代田区、中央区、港区、台东区、文京区、新宿区、板桥区、丰岛区、北区、荒川区、练马区的大半区域，已于1878年7月丰岛郡分割为东京府属的北丰岛郡和南丰岛郡。
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