Pierson Township is one of twelve townships in Vigo County, Indiana, United States.

At the 2010 census, the population was 1,210 and it contained 589 housing units.

[2] Frank Senour Round Barn was listed on the National Register of Historic Places in 1993.

[3] According to the 2010 census, the township has a total area of 36 square miles (93 km2), of which 35.35 square miles (91.6 km2) (or 98.19%) is land and 0.65 square miles (1.7 km2) (or 1.81%) is water.

[2] The township contains these six cemeteries: Armstrong, Brown, Donham, Ruggles, Stephens and Taylor.