Vigo Township is one of ten townships in Knox County, Indiana. As of the 2020 census, its population was 4,083 (up from 4,031 at 2010) and it contained 2,095 housing units. It contains the census-designated place of Westphalia.
Vigo Township was established in 1837. It was named for Col. François Vigo.
According to the 2010 census, the township has a total area of , of which (or 98.54%) is land and (or 1.45%) is water.
It is in the North Knox School Corporation.
Vigo Township residents may obtain a free library card from the Bicknell-Vigo Township Public Library.