Abraham Solomon Freidus (1866–October 2, 1923) was the first head of the Jewish literature department at the New York Public Library, holding that role from 1897 until his death in 1923. During Freidus's tenure there, the library dramatically expanded its collection of Jewish written works, and Freidus developed a system for organizing those materials that was arguably the first standard for cataloguing Jewish literature in the context of a large library holding. Freidus's classification system remains one of the main alternatives for organizing large collections of Jewish works.