The Diocese of Grand Rapids is a Latin Church diocese of the Catholic Church in western Michigan in the United States. It comprises 80 parishes in 11 counties. It is a suffragan see to the Archdiocese of Detroit. The mother church of the diocese is the Cathedral of Saint Andrew in Grand Rapids. On April 18, 2013, Pope Francis appointed David J. Walkowiak to be the twelfth bishop of Grand Rapids.

West Michigan and Western Michigan are terms for a region in the U.S. state of Michigan's Lower Peninsula. Generally, it refers to the Grand Rapids-Muskegon-Holland area, and more broadly to most of the region along the Lower Peninsula's Lake Michigan shoreline, but there is no official definition.