Llywelyn Breese was a politician from the U.S. state of Wisconsin. He was born May 13, 1833 in Merionethshire, Wales. He served as Wisconsin's tenth Secretary of State for two terms from January 3, 1870 to January 5, 1874. He was a Republican who served under governors Lucius Fairchild and Cadwallader C. Washburn. He resided in Portage, Wisconsin at the time of his election.