Vien (וויען) is an American Haredi Kehilla (community) originating in present-day Vienna. The name of their congregation is "Kehal Adas Yereim Vien" (קהל עדת יראים וויען) (translation: Congregation of the Reverent, Vienna).
Kehal Adas Yereim Vien was formally established on Sunday, May 25, 1941 by Klonumos Karl Richter. It traces its origins from a congregation of Oberlander Jews who had moved from Burgenland, Austria (primarily from the "Sheva Kehillos"), Slovakia and Hungary ('The Oberland') to Vienna (headquartering itself in the renowned Schiffschul) and then on to Williamsburg under the leadership of Rabbi Yonasan Steif.
Rabbi Yonasan Steif died in 1958, and was succeeded by Rabbi Ezriel Yehuda Lebowitz (Hudhazer Rov). After his passing on the first day of Rosh Hashana 1991 he was succeeded by the current Viener Rav, Rabbi Asher Anshel Katz. The current Rav took the viener Kehila to great new heights by expanding all of its existing institutions and by adding many new branches. Prior to his appointment, Rabbi Katz was the Rav of the Szombathely shul in Williamsburg which was established by his late father, Rabbi Yehoshua Katz who arrived in America after World War II from Szombathely, Hungary.