Sebastian Gebhard Messmer
| Sebastian Gebhard Messmer | |
|---|---|
| Archbishop of Milwaukee | |
| See | Archdiocese of Milwaukee | 
| Installed | December 10, 1903 | 
| Term ended | August 4, 1930 | 
| Predecessor | Frederick Katzer | 
| Successor | Samuel Stritch | 
| Other post(s) | Bishop of Green Bay (1892–1903) | 
| Orders | |
| Ordination | July 23, 1871 | 
| Consecration | March 27, 1892 | 
| Personal details | |
| Born | August 29, 1847 | 
| Died | August 4, 1930 (aged 82) Goldach, Switzerland | 
| Nationality | Swiss | 
| Denomination | Catholic Church | 
| Education | University of Innsbruck Pontifical Roman Athenaeum Saint Apollinare | 
Sebastian Gebhard Messmer (August 29, 1847 – August 4, 1930) was a Swiss-born American Catholic prelate who served as Archbishop of Milwaukee from 1903 to 1930. He previously served as Bishop of Green Bay (1892–1903).
Messmer is largely remembered as a political moderate. As a progressive for his time, Messmer opposed segregationist church policies based on race or language, and he was a major supporter of expanding Catholic-run welfare programs. But he also pushed back against socialism as the movement was growing in Wisconsin, and he opposed women gaining the right to vote.