Sugar Ridge Township is one of eleven townships in Clay County, Indiana. As of the 2020 census, its population was 914 (down from 939 at 2010) and it contained 438 housing units.
Sugar Ridge Township organized in 1854. It was named from a high ridge passing through its central portion.
The Aqueduct Bridge, Feeder Dam Bridge, and Jeffers Bridge are listed on the National Register of Historic Places.
According to the 2010 census, the township has a total area of , of which (or 98.26%) is land and (or 1.77%) is water. Dietz Lake is in this township.
(This list is based on USGS data and may include former settlements.)
The township contains three cemeteries: Gremes, Harris and Moss.