Armstrong Township is one of eight townships in Vanderburgh County, Indiana, United States.

As of the 2010 census, its population was 1,599 and it contained 634 housing units.

[2] Armstrong Township was established in 1818.

[3] According to the 2010 census, the township has a total area of 29.52 square miles (76.5 km2), of which 29.48 square miles (76.4 km2) (or 99.86%) is land and 0.04 square miles (0.10 km2) (or 0.14%) is water.

[2]