Vizhnitz is the name of a Hasidic dynasty founded by Rabbi Menachem Mendel Hager.
Vizhnitz (ויז׳ניץ or וויזשניץ) is the Yiddish name of Vyzhnytsia, a town in present-day Ukraine (then, a village in Austrian Bukovina).
He was appointed Rebbe at the age of 24, and soon after, he moved to Vyzhnytsia, a small town close to Kosiv.
His son-in-law was the son of Rabbi Yehoshua Rokeach of Belz, Reb Shmuel of Sokal.
In 1885, aged 40, he inherited the mantle of leadership from his father, Menachem Mendel Hager, and became rebbe to thousands of Hasidim.
In 1875, he moved to his father-in-law's house and studied at great length with his brother-in-law Rabbi Yehoshua of Dzikov.
Three years later he returned to Vyzhnytsia and became very close to his grandfather, Rabbi Menachem Mendel Hager.
Four of his sons became Rebbes: After the Holocaust, Reb Chaim Meir settled in Bnei Brak, Israel, to build a community there.
Disciples from pre-war Europe gathered around him, and formed a comprehensive net of educational and communal institutions.
The eldest daughter married Rabbi David Twersky, the Skverer Rebbe of New Square, New York.
One daughter married Rabbi Yissachar Dov Rokeach, the Belzer Rebbe from Jerusalem.
One daughter married Rabbi Aaron Teitelbaum, the Satmar Rebbe from Kiryas Joel, New York.