Francis Xavier Weninger (German: Franz Xaver Weninger; 31 October 1805, Wildhaus (Slovene: Viltuš), Styria, Austria (now Slovenia) - 29 June 1888, Cincinnati, Ohio) was an Austrian Jesuit missionary and author.
Weninger was born in Marburg an der Drau a province in southern Austria, to a prominent family with connections to the Austrian aristocracy.
He attended the gymnasium in Marburg, but having expressed an interest in a military career, his father sent him to Laybach to learn to be a pharmacist.
His progress was brought to the attention of Empress Caroline Augusta of Bavaria, who sponsored his further education at the University of Vienna.
During his forty years he visited almost every state of the Union, preaching in English, French, or German, as best suited the nationality of his hearers.