Oakfield Township is one of twelve townships in Audubon County, Iowa, United States. As of the 2010 census, its population was 314.
Oakfield Township was organized in 1874. It is named after Oakfield, New York, the former home of an early settler.
Oakfield Township covers an area of and contains no incorporated settlements. According to the USGS, it contains three cemeteries: Oak Hill, Oakfield and Saint Johns.