Harrison Township is one of twelve townships in Pulaski County, Indiana, United States.

As of the 2020 census, its population was 590 and it contained 265 housing units.

[1] Harrison Township was organized in 1841, and named for William Henry Harrison (1773–1841), the ninth President of the United States (1841).

[3] According to the 2010 census, the township has a total area of 31.6 square miles (82 km2), of which 31.51 square miles (81.6 km2) (or 99.72%) is land and 0.09 square miles (0.23 km2) (or 0.28%) is water.

[4] Harrison Township residents may obtain a free library card from the Pulaski County Public Library in Winamac.