St. Olaf's Church (Finnish: Pyhän Olavin kirkko, Swedish: S:t Olofs kyrka), also known as Ulvila Church (Finnish: Ulvilan kirkko, Swedish: Ulvsby kyrka), is a church of the Evangelical Lutheran Church of Finland in Ulvila, Finland. The church is considered one of the best-preserved medieval fieldstone churches in Finland and is the only remaining structure from the medieval town of Ulvila. St. Olaf has been the patron saint of the church since before 1429.