The Roman Catholic Diocese of Grand Rapids is a diocese of the Roman Catholic Church in western Michigan, in the United States. It comprises 102 churches in Ottawa, Kent, Ionia, Muskegon, Newaygo, Oceana, Montcalm, Mecosta, Lake, Mason, and Osceola counties in Michigan. It is a suffragan see to the Archdiocese of Detroit. The motherchurch of the diocese is the Cathedral of Saint Andrew. On April 18, 2013, Pope Francis accepted Bishop Walter A. Hurley's resignation and appointed the Rev. David J. Walkowiak to be the twelfth Bishop of Grand Rapids.