Calmar is a city in Winneshiek County, Iowa, United States. The population was 1,058 at the 2000 census. It is located at the junction of U.S. Highway 52 and State highways 150 and 24. Both 150 and 24 have their terminating points in Calmar.
Calmar is located at 43°10′55″N 91°51′59″W / 43.18194°N 91.86639°W / 43.18194; -91.86639 (43.182054, -91.866446).
According to the United States Census Bureau, the city has a total area of 1.0 square miles (2.7 km²), all of it land.