Monroe Township is one of twenty townships in Benton County, Iowa, United States.

As of the 2000 census, its population was 259.

[1] Monroe Township was founded in 1851.

[2] According to the United States Census Bureau, Monroe Township covers an area of 36.31 square miles (94.04 square kilometers); of this, 36.3 square miles (94.01 square kilometers, 99.97 percent) is land and 0.01 square miles (0.03 square kilometers, 0.03 percent) is water.

The township contains these four cemeteries: Gnagy, Ramthun, Saint Joseph and Urmy.