Frederick William Horn (August 21, 1815 – January 15, 1893) was a German-Americanimmigrant, lawyer, and politician. He was the 4th, 7th, and 25th Speaker of the Wisconsin State Assembly. He represented Ozaukee County for a total of 14 years in the Assembly and served as a senator in the first three sessions of the Wisconsin State Senate.
Horn was born in Linum, in the Province of Brandenburg, in what was then the Kingdom of Prussia (now Germany). He was educated in Berlin, at the Gymnasium of the Gray Friar, but did not graduate, and entered the military service of Prussia.
He emigrated to the United States in 1836, first residing in New York state, then making his way west in 1837. He made his residence in Michigan but traveled extensively through Illinois, Iowa, Missouri, and finally Wisconsin. He arrived in Milwaukee, in the Wisconsin Territory, in 1840 and, in 1841, settled in Mequon, in what was then Washington County. He resided here until his final move, to the neighboring community of Cedarburg, in 1847. He practiced law in Cedarburg and served as Mayor. He also served on the Ozaukee CountyBoard of Supervisors and was editor of the Cedarburg Weekly News.
In 1842 Horn entered his first public office when James Duane Doty, Governor of the Wisconsin Territory, appointed him Justice of the Peace for Washington County. He also served as postmaster for Mequon, while he was residing there, and was Register of Deeds for the county in 1846 and 1847.
In 1848, he ran for and was elected to the first session of the Wisconsin State Senate, running as an independent Democrat. He was re-elected in November 1848 to a full two-year term in the Senate.
In 1850, he was elected to the Wisconsin State Assembly for the 1851 session, and was chosen as the Speaker of the Assembly for that session. In 1853, Ozaukee County was created out of the eastern part of Washington County. That same year, Horn was elected as one of the first two representatives of Ozaukee County in the Wisconsin Assembly for the 1854 session, he was again chosen as Speaker for that session.
Later in 1854 and 1855, he served as Wisconsin’s Commissioner for Immigration in New York City, directing new immigrants and settlers to Wisconsin.
He served again in the 1859 and 1860 sessions of the Wisconsin Assembly. Also during this time, he represented Wisconsin on the Democratic National Committee, and was Vice President of the 1860 Democratic National Conventions in Charleston and Baltimore. He was also a delegate for Wisconsin at the 1868 Democratic National Convention.
He served as Ozaukee County Commissioner of Schools from 1862 to 1865, but returned to the Assembly again in 1867, 1868, and 1872. He was elected in 1874 with both Democratic and Republican support, and was then chosen as Speaker again for the 1875 session of the Assembly. He went on to serve another five years in the Assembly, in 1882, 1887, 1888, 1889, and 1890.
In 1890, he was elected to a four-year term in the Wisconsin State Senate, but he would die in January 1893 before the end of that term.
Horn was also active in local politics during this time, serving as Mayor of Cedarburg for the first seven years after it was incorporated as a city in 1885, and serving as Chairman of the Ozaukee County Board of Supervisors for the last four years of his life, from 1889 to 1893.
Horn is the namesake of the community of Horns Corners, Wisconsin.