The Kilmarnock Burghs by-election was a Parliamentary by-election held on 26 September 1911. It returned one Member of Parliament (MP) to the House of Commons of the United Kingdom, elected by the first past the post voting system. The constituency consisted of five parliamentary burghs: Kilmarnock in the county of Ayr, Dumbarton in the county of Dumbarton, Rutherglen in the county of Lanark and Renfrew and Port Glasgow in the county of Renfrew.