Beulah Township is a township in Cass County, Minnesota, United States. The population was 57 as of the 2000 census. Beulah Township was named for Beulah Olds, a pioneer settler. According to the United States Census Bureau, the township has a total area of 35.7 square miles, of which 34.7 square miles is land and 1.1 square miles is water.