The Calder River is a river in North West Tasmania, Australia, it extends approximately 15 kilometres (9.3 mi) from the Campbell Ranges near Henrietta before reaching its confluence with the Inglis River near Calder.

[1] The river is transversed by the Murchison Highway in its upper reaches.

Part of the course of the river is located adjacent to the 65.21-hectare (161.1-acre) Calder River Conservation Area.

[2][3] The river and the adjacent town was named in honour of James Erskine Calder, the Surveyor General of Tasmania between 1859 and 1870.

[4]