沼岛（日语：沼島／ぬしま Nushima */?）是日本淡路岛南方的一座小岛，距淡路岛约5公里。面积2.5平方公里，岛上最高点海拔117.2公尺，行政上隶属于兵库县南淡路市，常住人口598人。沼岛亦属于濑户内海国立公园的一部份。
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