Otter Creek Township is one of twelve townships in Vigo County, Indiana, United States. As of the 2010 census, its population was 9,069 and it contained 3,917 housing units.
Markle House and Mill Site was listed on the National Register of Historic Places in 1979.
According to the 2010 census, the township has a total area of , of which (or 98.96%) is land and (or 1.04%) is water.
The township contains ten cemeteries: Denny, Evans, Haven, Kennedy, Markles, Phillips, Roselawn Memorial Park, Steveson, Stewart and Wood.