There are 54 mathematicians whose last name begin with OKA.
| Oka, Mutsuo | Université Paris-Sud XI - Orsay | 1975 |
| Oka, Simeon | University of Belgrade | 1971 |
| Oka, Tatsushi | Boston University | 2010 |
| Oka, Toshifusa | Massachusetts Institute of Technology | 1993 |
| Okabayashi, Saisuke | University of Minnesota - Twin Cities | 2011 |
| Okada, Daijiro | State University of New York at Stony Brook | 1997 |
| Okada, Eisuke | The University of Chicago | 2012 |
| Okada, Emile | University of Oxford | 2022 |
| Okada, Kanzo | Oregon State University | 1981 |
| Okada, Mitsuhiro | Keio University | 1987 |
| Okada, So | University of Massachusetts Amherst | 2006 |
| Okada, Susumu | Flinders University | 1984 |
| Okada, Taihei | Bowling Green State University | 1993 |
| Okada, Takuzo | Kyoto University | 2009 |
| Okada, Yasunori | University of Tokyo | 1997 |
| Okada, Yoshitomo | Tohoku University | 1924 |
| Okada da Silva, Hector | University of Mississippi | 2017 |
| Okafor, Antony | University of Florida | 2005 |
| Okajima, Isamu | Oregon State University | 1971 |
| Okamoto, Hisashi | University of Tokyo | 1985 |
| Okamoto, K. | ||
| Okamoto, Kazuo | University of Tokyo | 1978 |
| Okamoto, Kentaro | Kyushu University | 2018 |
| Okamoto, Kiyosato | Osaka University | 1965 |
| Okamoto, Masashi | Kyushu University | 1962 |
| Okamoto, Nivholas | University of Missouri - Columbia | 2017 |
| Okamoto, Renato | Universidade Federal do Rio de Janeiro | 2008 |
| Okamoto, Shingo | The Pennsylvania State University | 1991 |
| Okamoto, Takuya | Nagoya University | 2012 |
| Okamoto, Yoshio | ETH Zürich | 2005 |
| Okamura, Fumiya | Nagoya University | 2025 |
| Okamura, Hiroshi | Kyoto University | 1940 |
| Okano, Hatsuo | Osaka University | 1960 |
| Okano, Ryo | University of Tokyo | 2025 |
| Okano, Ryota | Tokyo University of Science | 2021 |
| Okano, Takeshi | Chiba University | 1997 |
| Okano, Tsutomu | University of Illinois at Urbana-Champaign | 2021 |
| Okasaki, Christopher | Carnegie Mellon University | 1996 |
| Okasha, Nahed | Texas Tech University | 1995 |
| Okashimo, Katsumi | University of Toronto | 1955 |
| Okassa, Eugène | Université Joseph Fourier Grenoble I | 1989 |
| Okawa, Shinnosuke | University of Tokyo | 2012 |
| Okay, Cihan | University of British Columbia | 2014 |
| Okay, Irfan | North Carolina State University | 2008 |
| Okayasu, Rui | University of Tokyo | 2003 |
| Okayasu, Rui | Kyoto University | 2003 |
| Okazaki, Akira | Kyushu University | 2025 |
| Okazaki, Al | University of Wisconsin-Madison | 1955 |
| Okazaki, Kenta | Kyoto University | 2013 |
| Okazaki, Ryotaro | Kyoto University | 1993 |
| Okazaki, Satomi | Massachusetts Institute of Technology | 1996 |
| Okazaki, Taichiro | University of Texas at Austin | 2004 |
| Okazaki, Takeo | Osaka University | 2004 |
| Okazawa, Noboru | Waseda University | 1973 |