Isaac Husik (1876–1939) (Hebrew: יצחק הוזיק) was a Jewish historian, translator, and student of philosophy, one of the first three individuals to serve as official faculty at Gratz College in Philadelphia.
Husik was born in Vasseutinez near Kiev, Russian Empire on 10 February 1876. Because of the worsening climate under the Russian imperial May Laws, in 1888, when he was 12 years old, he moved with his mother to Philadelphia. His father, the teacher Wolf Husik, rejoined them the following year. Isaac received his early instruction from his father and from Dr. Sabato Morais, rabbi at the Sephardic congregation Kahal Kadosh Mikveh Israel in Philadelphia, and one of the founders of the Jewish Theological Seminary (JTS). Husik attended JTS while preparing for secular studies, and received direct guidance from Dr. Morais, but did not ultimately pursue a rabbinical career.
Husik attended Central High School (Philadelphia), and then enrolled at University of Pennsylvania, where he received a master's degree in Mathematics in 1899. Ultimately, however, his interests turned to the study of the classics, especially Aristotle, and he received his Ph.D. in Philosophy from University of Pennsylvania in 1903. His thesis, entitled Judah Messer Leon's Commentary on the Vetus Logica, was published in Leyden in 1906.
While still a student at Penn, Husik accepted an Instructorship in Hebrew and Bible at Gratz College, but simultaneously remained an instructor in Philosophy at Penn. He eventually left Gratz, and was appointed full Professor of Philosophy at Penn in 1922. He taught classes also at Yeshiva College, Hebrew Union College, and Columbia University Summer School.