The Steilacoom Catholic Church (also known as the Church of the Immaculate Conception) is a Roman Catholic church in Steilacoom, Washington, United States. It was originally built in 1855 near Fort Steilacoom, but was moved to its present location in 1864. It was the first Catholic church built in Washington. It was a mission church.
The church was added to the National Register of Historic Places in 1974.