George Cumberlege Loughnan (1842 – 18 January 1896) was an Australian politician.
He was born at Hobart in Van Diemen's Land; his father John Michael Loughnan was a captain in the 10th Bengal Lancers.
Loughnan was educated at Hobart and at Stonyhurst in England.
In 1872 he purchased property of his own; he also worked as a stock and station agent.
In 1880 he was elected to the New South Wales Legislative Assembly for Murrumbidgee, serving until his retirement in 1885.