Dundas is an unincorporated community in Lunenburg County, Virginia, United States. Dundas is located on Virginia State Route 137 in eastern Lunenburg County, 6.6 miles (10.6 km) east-southeast of Kenbridge. Dundas has a post office with ZIP code 23938, which opened on February 20, 1908. The Dundas Ruritan Club claims to make the best sheep stew in the world, cooking it twice a year in large batches to raise money for Ruritan community-service projects.