Wallendbeen is a small town in southern New South Wales, Australia, administered by Cootamundra Shire Council. At the , Wallendbeen and the surrounding area had a population of 316. The town's name is derived from an aboriginal word for "stony hill".
The town is located on the intersection of the Olympic Highway and the Burley Griffin Way and on the Sydney–Melbourne railway, opened to Wallendbeen in 1877. Wheat is an important industry for the area. It has a fine oval, which has supported a cricket club since 1887. Wallendbeen Post Office opened on 1 July 1885.
It is now becoming a dormitory suburb of Cootamundra.