Ogden Dunes is a town in Portage Township, Porter County, in the U.S. state of Indiana. It is located on the shore of Lake Michigan, within Indiana Dunes National Park and nearly surrounded by the city of Portage. The population was 1,110 at the 2010 census. It is named for multi-millionaire Francis A. Ogden, who owned the land there before his death in 1914. His main interest in the land where the dunes are was the sand which could be scooped up and sold, with more sand being replenished naturally over time.

Portage Township is one of twelve townships in Porter County, Indiana. As of the 2010 census, its population was 47,085. Portage Township was established in 1835.