The Victor Harbor railway line is a 1600 mm broad gauge line in South Australia. It originally branched from the Adelaide to Melbourne line at Mount Barker Junction then ran 80.6 kilometres south to Victor Harbor. When the mainline was converted to 1435 mm standard gauge and the junction was closed, the northern end of the Victor Harbor line was curtailed at Mount Barker, 3 kilometres from the junction.

Victor Harbor is a town in the Australian state of South Australia located within the City of Victor Harbor on the south coast of the Fleurieu Peninsula, about 82 kilometres (51 mi) south of the state capital of Adelaide. The town is the largest population centre on the peninsula, with an economy based upon agriculture, fisheries, and tourism. It is a popular tourist destination, with the area's population greatly expanded during the summer holidays, usually by Adelaide locals looking to escape the summer heat.