There are 57 mathematicians whose last name begin with ORL.
| Orland, George | University of California, Berkeley | 1962 |
| Orland, Peter | ||
| Orlandi, Claudio | Aarhus University | 2011 |
| Orlandi, P. | ||
| Orlandic, Ratko | University of Virginia | 1989 |
| Orlandi-Korner, Lisa | Cornell University | 1998 |
| Orlando, Giovanni | 1992 | |
| Orlando, Giuseppe | Politecnico di Milano | 2022 |
| Orlando, José | Universidad Nacional del Centro de la Provincia de Buenos Aires | 2017 |
| Orlando, Wendell | University of Washington | 1996 |
| Orlanski, Isidoro | Massachusetts Institute of Technology | 1967 |
| Orlanski, Olga | Albert-Ludwigs-Universität Freiburg im Breisgau | 2018 |
| Orleans, Doug | Northeastern University | 2005 |
| Orlebeke, Jacobus | Vrije Universiteit Amsterdam | 1972 |
| Orlich, Milo | Aalto-yliopisto | 2022 |
| Orlicki, David | Massachusetts Institute of Technology | 1985 |
| Orlicz, Władysław | University of Lwów | 1928 |
| Orlik, Julia | Universität Kaiserslautern | 2000 |
| Orlik, Peter | University of Michigan | 1966 |
| Orlik, Sascha | Universität zu Köln | 1999 |
| Orlikowski, Wanda | New York University | 1988 |
| Orlin, James | Stanford University | 1981 |
| Orlin, Peter | University of Southern Mississippi | |
| Orlinsky, Kayla | University of Southern California | 2023 |
| Orlitsky, Alon | Stanford University | 1986 |
| Orlitzky, Michael | University of Maryland Baltimore County | 2017 |
| Orlob, Gerald | Stanford University | 1959 |
| Orlob, Johannes | Rheinisch-Westfälische Technische Hochschule Aachen | 2009 |
| Orlob, Michael | Rheinisch-Westfälische Technische Hochschule Aachen | 1976 |
| Orlof, Anna | Linköpings Universitet | 2017 |
| Orloff, Daniel | The University of Chicago | 1951 |
| Orloff, Jeremy | Massachusetts Institute of Technology | 1985 |
| Orloff, Mohammed | Case Western Reserve University | 2005 |
| Orloff, Tobias | Princeton University | 1983 |
| Orlov, Dmitri | Lomonosov Moscow State University | 1991 |
| Orlov, Igor | Vilniaus universitetas | 1988 |
| Orlov, Ilan | Ben-Gurion University of the Negev | 2014 |
| Orlov, Konstantin | University of Belgrade | 1934 |
| Orlov, Mikhail | Kiev State University | |
| Orlov, Sergei | Lomonosov Moscow State University | |
| Orlov, Sergei | Odesa University | 1953 |
| Orlov, Sergei' | Saratov State University | 1973 |
| Orlov, Vladimir | Voronezh State University | 1975 |
| Orlov, Yury | ||
| Orlova, Natalia | Moscow State Pedagogical Institute | |
| Orlova, Tatiana | The University of Chicago | 2016 |
| Orlova, Yuliia | Universiteit van Amsterdam | 2020 |
| Orlovs, Pāvels | Latvijas Universitāte | 2016 |
| Orlow, Sanford | The Johns Hopkins University | 1968 |
| Orlowicz, Agata | Victoria University of Wellington | 2017 |
| Orlowska, Ewa | Uniwersytet Warszawski | 1971 |
| Orłowska, Maria | Politechnika Warszawska | 1980 |
| Orlowski, Krzysztof | Politechnika Wrocławska | 1978 |
| Orlowski, Sebastian | Technische Universität Berlin | 2009 |
| Orłowski, Marian | Institute of Mathematics, Polish Academy of Sciences | 1977 |
| Orlt, Matthias | Universität Rostock | 1998 |
| Örlü, Ramis | Kungliga Tekniska Högskolan (KTH) | 2009 |