Donald Mark Ritchie (born December 21, 1951) is a Minnesota politician and a former Minnesota Secretary of State. Ritchie was elected the 21st Minnesota Secretary of State on November 7, 2006. He was re-elected in 2010. He is a member of the Democratic-Farmer-Labor Party. He grew up in Iowa, and graduated from Iowa State University in 1971. He and his wife, Nancy Gaschott, have lived in Minneapolis since 1986.