Samuel Jacob Rabinowitz (Yiddish: שמואל יעקב בן שמעון מאיר ראבינאוויץ; 1857–1921) was a Lithuanian rabbi, writer, and Zionist leader.

He has been described as the "greatest spokesman of religious Zionism before Reines.

He was an early member of Ḥovevei Zion,[2] and was a delegate to the Second Zionist Congress at Basel.

[3] Rabinowitz contributed a number of articles to Ha-Melitz, which later were published under the title Ha-Dat veha-Le'ummiyyut (Warsaw, 1900).

A collection of his responsa and novellae were published as Sefer Oraḥ Yashar in Vilna in 1903.