There are 15 mathematicians whose last name begin with ONI.
| Oni, Blessing | Scuola Internazionale Superiore di Studi Avanzati (SISSA) | 2023 |
| Onica, Constantin | Texas A&M University | 2005 |
| Onicescu, Octav | Università di Roma La Sapienza | 1920 |
| Oniciuc, Cezar | ||
| Onieva-Aleixandre, Victor | Universidad de Zaragoza | 1971 |
| Oniga, Teodora | University of Aberdeen | 2017 |
| Onigkeit, Dietmar | Universität Zürich | 1961 |
| Oniki, Hajime | Stanford University | 1968 |
| Onink, Marcel | Technische Universiteit Delft | 1995 |
| Onishchenko, Alexey | ||
| Onishchenko, Galina | Kharkiv National University of Radioelectronics | 1969 |
| Onishchik, Arkady | Lomonosov Moscow State University | |
| Onishi, Hironori | Massachusetts Institute of Technology | 1961 |
| Onisk, Lucas | Kent State University | 2022 |
| Oniushev, Aleksandr | Kharkiv National University of Radioelectronics | 1982 |