There are 19 mathematicians whose last name begin with OER.
| Oeri, Hans | University of Victoria | 2023 |
| Oerlemans, Adrianus | Universiteit van Amsterdam | 1949 |
| Oerlemans, Alwin | Universiteit Maastricht | 1992 |
| Oerlemans, Ard | Universiteit Leiden | 2011 |
| Oerlemans, Johannes | Universiteit Utrecht | 1980 |
| Oertel, Christian | Friedrich-Schiller-Universität Jena | 2019 |
| Oertel, Frank | Universität Kaiserslautern | 1991 |
| Oertel, Gottlob | Martin-Luther-Universität Halle-Wittenberg | 1767 |
| Oertel, Johannes | Martin-Luther-Universität Halle-Wittenberg | 1715 |
| Oertel, Karina | Universität Rostock | 2003 |
| Oertel, Karl | Ludwig-Maximilians-Universität München | 1890 |
| Oertel, Peter | Universität zu Köln | 2001 |
| Oertel, Timm | ETH Zürich | 2014 |
| Oertel, Ulrich | University of California, Los Angeles | 1980 |
| Oerter, Robert | University of Maryland College Park | 1989 |
| Oertli, Heinrich | ETH Zürich | 1923 |
| Örlü, Ramis | Kungliga Tekniska Högskolan (KTH) | 2009 |
| Örs, Sıddıka Berna | Katholieke Universiteit Leuven | 2005 |
| Öry, Aniko | University of California, Berkeley | 2014 |