St. Augustine Catholic Church and Cemetery is a historic church site at Co. Hwy. Y 3 miles south of the junction of Co. Hwy. Y and SR 33 in the Town of Trenton, Wisconsin, United States. It was built in 1856 by a community of Catholic immigrants from the Kingdom of Bavaria. Like many early structures in southeastern Wisconsin, it is made of mortared fieldstone, and is one of four surviving fieldstone churches in Washington County, Wisconsin.