Two new late Early Ordovician orthide brachiopods, Celsiorthis bulancis n.gen. and n.sp. and Alocorthis psygmatelos n.gen. and n.sp., are described from the Tabita and Pingbilly formations at Mount Arrowsmith, northwestern New South Wales. The associated conodont assemblage from the succession at Mount Arrowsmith indicates a late Bendigonian to Chewtonian age for the brachiopod bearing horizons.