J. Geronimus may refer to:
Yakov Lazarevich Geronimus (1898-1984), a Russian mathematician known for contributions to theoretical mechanics and the study of orthogonal polynomials Yuri Veniaminovich Geronimus, a Russian mathematician, who worked on the book Gradshteyn and Ryzhik in the 1960s and early 1970s
See also Geronimus (disambiguation)