| Llywelyn Breese | |
| Order: | 10th |
| Office: | Secretary of State of Wisconsin |
| Term Start: | January 3, 1870 |
| Term End: | January 5, 1874 |
| Governor: | Lucius Fairchild Cadwallader C. Washburn |
| Predecessor: | Thomas Allen |
| Successor: | Peter Doyle |
| Birth Date: | 13 May 1833 |
| Birth Place: | Mallwyd, Merionethshire, Wales |
| Nationality: | American |
| Party: | Republican |
| Residence: | Portage, Wisconsin, U.S. |
| Occupation: | Politician |
Llywelyn Breese was a politician from the U.S. state of Wisconsin. He was born May 13, 1833, in Mallwyd, 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.