Bridgewater is a city in Jackson Township, Adair County, Iowa, United States. The population was 178 at the 2000 census. Bridgewater was founded in 1885.
Bridgewater is located at 41°14′44″N 94°40′6″W / 41.24556°N 94.66833°W / 41.24556; -94.66833 (41.245491, -94.668288). Mormon Trail Lake and Park are located outside of town.
According to the United States Census Bureau, the city has a total area of 0.29 square miles (0.8 km²), all of it land.