Otto Szász (11 December 1884, Hungary – 19 December 1952, Cincinnati, Ohio) was a Hungarian mathematician who worked on real analysis, in particular on Fourier series. He proved the Müntz–Szász theorem and introduced the Szász–Mirakyan operator. The Hungarian Mathematical and Physical Society awarded him the Julius König prize in 1939.
- Szász, Otto (1955), Collected mathematical papers, Department of mathematics, University of Cincinnati, Cincinnati, Ohio, MR 0066285
- Groetsch, Charles, Otto Szász
- O'Connor, John J.; Robertson, Edmund F., "Otto Szász", MacTutor History of Mathematics archive, University of St Andrews.
- Otto Szász at the Mathematics Genealogy Project
- Szegö, Gabor (1954), "Obituary: Otto Szász", Bulletin of the American Mathematical Society 60 (3): 261–263, doi:10.1090/S0002-9904-1954-09794-X, ISSN 0002-9904, MR 0061071