Immaculate Conception Catholic Church is a parish of the Roman Catholic Church in Celina, Ohio, United States. Founded later than many other Catholic parishes in the heavily Catholic region of western Ohio, it owns a complex of buildings constructed in the early 20th century that have been designated historic sites because of their architecture. Leading among them is its massive church, built in the Romanesque Revival style just 43 years after the first Catholic moved into the city: it has been called northwestern Ohio's grandest church building.

The Land of the Cross-Tipped Churches is a rural region in the western part of the U.S. state of Ohio, centered near Maria Stein in Mercer County. Its name is derived from the dense concentration of large Catholic churches that dominate the area's architecture. These and other buildings were constructed by the Society of the Most Precious Blood under the oversight of the missionary priest Francis de Sales Brunner. Under his leadership, the Society founded many churches and schools in the region, as well as several seminaries.