Leerdam is a city and former municipality in the western Netherlands, in the province of Utrecht. The municipality was merged with the municipalities of Vianen and Zederik on 1 January 2019. The name of the new municipality is Vijfheerenlanden which is a part of the province Utrecht. The former municipality Leerdam was a part of the province South Holland. The south border of the town is formed by the river Linge.