George Dunmore Lang (30 September 1832 – 12 January 1875) was an Australian politician.
He attended the University of Glasgow and the University of Edinburgh, returning to work as a clerk for the Bank of New South Wales.
He was arrested in 1854 and sentenced to five years' hard labour, but he was released in 1857 after an enquiry by the parliament.
He then worked as a journalist in Brisbane, and in 1859 was elected to the New South Wales Legislative Assembly for Tumut.
He resigned in 1860 and travelled to Scotland, where he was an agent for the Moreton Bay Company.