William Feiner SJ (born Wilhelm Feiner; December 27, 1792 – June 9, 1829) was a German Catholic priest and Jesuit who became a missionary to the United States and eventually the president of Georgetown College, now known as Georgetown University.

Born in Münster, he taught in Jesuit schools in the Russian Empire and Polish Galicia as a young member of the Society of Jesus. He then emigrated to the United States several years after the restoration of the Society, taking up pastoral work and teaching theology in Conewago, Pennsylvania, before becoming a full-time professor at Georgetown College. There, he also became the second dedicated librarian of Georgetown's library. Eventually, Feiner became president of the college in 1826. While president, he taught theology at Georgetown and ministered to the congregation at Holy Trinity Church.

Despite being the leader of an American university, he never mastered the English language. Long plagued by poor health due to tuberculosis, his short-lived presidency ended after three years, just weeks before his death.

Wilhelm Feiner was born on December 27, 1792, in the city of Münster in the Prince-Bishopric of Münster (in modern-day Germany).^[2][3] He entered the Society of Jesus on July 12, 1808, in White Russia^[4] (i.e. Belarus),^[5] officially becoming a member on August 7 of that year.^[6] Before emigrating to the United States, he taught in Jesuit schools in Polish Galicia and the Russian Empire,^[2][7] where the Jesuits were permitted to operate despite being suppressed by the pope and expelled from Western Europe.^[8] For this reason, he was sometimes erroneously identified as being Polish rather than German.^[2]

When the president of Georgetown College, Stephen Larigaudelle Dubuisson, was permitted to resign the office, he eagerly sailed to Europe.^[20][21] Feiner was appointed president on May 4, 1826,^[4] by the Jesuit provincial superior, Francis Dzierozynski. He assumed the office on July 8, 1826,^[22] despite suffering from advanced tuberculosis and being unable to speak even basic English;^[23] indeed, he never mastered the English language.^[24] When he learned of the provincial's order, he is said to have entered Dubuisson's room sobbing and declaring that he was neither competent to hold the office nor desirous of it.^[23] While president, Feiner ministered to the congregation at Holy Trinity Church in Georgetown.^[9] He also worked as a professor of moral theology in 1828 and of dogmatic theology in 1829.^[25]

Given Feiner's failing health, John W. Beschter left Baltimore for the college, anticipating that he would have to succeed Feiner as president.^[26] Two historians of the university, John Gilmary Shea and Robert Emmett Curran, judged Feiner's administration, like others of the decade, to be lackluster.^[27][22] He resigned on March 30, 1829,^[28] and died at Georgetown College on June 9 of that year.^[2]