Volinia Township is a civil township of Cass County in the U.S. state of Michigan. The population was 1,112 at the 2010 census. When the township was organized in 1833, it was at first named Volhynia, after the province in Poland. It is believed to have been given to honor General Tadeusz Kościuszko, the Polish patriot who helped the United States during the American Revolutionary War.