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 January 1, 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. The name originates from a dam in the river Lede which was a branch from the river Linge towards Meerkerk. Leerdam is situated almost exactly in the middle of the three highways A2, A15 and A27.