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Irwin is a city in Shelby County, Iowa, United States, along the West Nishnabotna River. The population was 372 at the 2000 census.
Irwin is located at 41°47′26″N 95°12′26″W / 41.79056°N 95.20722°W / 41.79056; -95.20722 (41.790449, -95.207341).
According to the United States Census Bureau, the city has a total area of 0.6 square miles (1.6 km²), all of it land.