Springfield Township is one of twenty townships in Allen County, Indiana, United States.

As of the 2010 census, its population was 4,349.

[4] The principal town in Springfield Township is the village of Harlan.

Springfield Township covers an area of 35.37 square miles (91.60 km2); 0.066 square miles (0.17 km2), or 0.19 percent of this is water.

[4] (This list is based on USGS data and may include former settlements.)