Arthur Alfred Lynch (16 October 1861 – 25 March 1934) was an Irish Australian civil engineer, physician, journalist, author, soldier, anti-imperialist and polymath. He served as MP in the UK House of Commons as member of the Irish Parliamentary Party, representing Galway Borough from 1901 to 1902, and later West Clare from 1909 to 1918. Lynch fought on the Boer side during the Boer War in South Africa, for which he was sentenced to death but later pardoned. He supported the British war effort in the First World War, raising his own Irish battalion in Munster towards the end of the war.