Frederick Xavier Katzer (February 7, 1844 – July 20, 1903) was an Austrian-born American Catholic prelate who served as Archbishop of Milwaukee from 1891 to 1903.

In 1857, he entered the minor seminary run by the Jesuits in Freinberg in Upper Austria to pursue his classical studies.

[4] However, Kalzer then spoke to Reverend Joseph Salzmann, founder of the new Saint Francis de Sales Seminary in Milwaukee, Wisconsin.

With the Diocese of Milwaukee needing more priests who spoke German, Salzmann convinced Katzer to complete his theological studies and be ordained there.

[4] After finishing at Saint Francis de Sales, Katzer was ordained a priest for the Archdiocese of Milwaukee on December 21, 1866, by Bishop John Henni.

[2] Following Krautbauer's death, Katzer was appointed the third bishop of Green Bay on July 13, 1886, by Pope Leo XIII.

Katzer denounced the law as "a step by which Antichrist is trying to promote its attacks on the Church and accomplish its oppression by the state.

[9] After Heiss died in March 1890 the bishops of Wisconsin recommended three German-speaking candidates to replace him to Leo XIII.

Katzer praised the pope's condemnation of "the errors called by the name of Americanism with all the more joy and gratitude because the decision of the infallible See appeared to us very opportune.

Cahensly claimed that Catholic immigrants in the United States were leaving the faith due to a lack of priests and churches of their own nationalities.

added his name to a letter written by Archbishop Michael Corrigan of New York opposing the plan, and was considered along with Ireland for presenting both sides of the school question to Rome.

[10] At the beginning of Katzer's tenure in 1891, the archdiocese contained 227 priests, 268 churches, and 125 parochial schools to serve a Catholics population of 180,000.