Rabbi Yitzchok Friedman (1850 – 11 March 1917) was the founder and first Rebbe of the Boyan Hasidic dynasty.

The Pachad Yitzchok was the eldest son of Rabbi Avrohom Yaakov Friedman (1820–1883), the first Sadigura Rebbe,[1] and his wife Miriam.

The Rebbe encouraged one of his wealthy Hasidim, Dov Ber Horenstein, who was childless, to build houses in Jerusalem as a memorial for himself.

[6] The Boyaner Rebbe was known for his piety and humility; however, he presented a regal face to the public and lived in a palatial home.

He inherited the title of Nasi (president) of Kolel Vohlin in the Land of Israel from his father, and this gave him the responsibility of coordinating all funds sent for the welfare of the Orthodox community while living there.

Rabbi Menachem Nachum, his eldest son, became the Boyaner Rebbe in Chernowitz, Bukovina.

[12] Then, the Pachad Yitzchok's second son, Rabbi Yisroel (1878–1951), became the Boyaner Rebbe in Leipzig, Germany.