George Washington Thomas Lambert ARA (13 September 1873 - 29 May 1930) was an Australian artist, known principally for portrait painting and as a war artist during the First World War. Lambert began exhibiting his pictures at the Art Society and the Society of Artists, Sydney in 1894. In 1899 he won the Wynne Prize with Across the Blacksoil Plains. He spent a year in Paris before moving to London where he exhibited at the Royal Academy. Lambert was awarded a silver medal at an international exhibition for his painting The Sonnet in Barcelona in 1911.