Joseph Lehner (October 29, 1912, New York City – August 5, 2013, Haverford, PA) was a mathematician at Michigan State University (1957–1963), the University of Maryland (1963–1972), and the University of Pittsburgh (1972–1980). He worked on automorphic functions and introduced Atkin–Lehner theory.

• Lehner, Joseph (1964), Discontinuous groups and automorphic functions, Mathematical Surveys, vol. VIII, Providence, R.I.: American Mathematical Society, MR 0164033
• Lehner, Joseph (1966), A short course in automorphic functions, New York-Toronto, Ont.-London: Holt, Rinehart and Winston, MR 0201637
• Lehner, Joseph (1969), Lectures on modular forms, Applied Mathematics Series, vol. 61, National Bureau of Standards, MR 0264070
• Atkin, A. O. L.; Lehner, J. (1970), "Hecke operators on Γ₀ (m)", Mathematische Annalen, 185 (2): 134–160, doi:10.1007/BF01359701, ISSN 0025-5831, MR 0268123, S2CID 120159177

• Joseph Lehner at the Mathematics Genealogy Project
• Berndt, Bruce C.; Li, Wen-Ching Winnie; Smart, J. R. (2015), "Joseph Lehner Obituary" (PDF), Op-Sf Net, 22 (3): 11–12