The BHP Whyalla DH class were a class of diesel locomotives built by Walkers Limited, Maryborough for the BHP's Whyalla Steelworks between 1962 and 1968.
In 1962 three locomotives were purchased by BHP for use at its new Whyalla Steelworks. Initially used on construction trains until the facility opened in 1964. A further two were delivered in 1965. All were built for use on the standard gauge. In March 1968 a sixth was purchased for use on the narrow-gauge line between Hummock Hill and the blast furnaces.
All six members of this class have been scrapped with DH1 being the last to be scrapped, having been transferred to Australian Southern Railroad when it took over OneSteel's rail operations in 2000.