There are 24 mathematicians whose last name begin with KOI.
| Koibaev, Vladimir | St. Petersburg State University | 1982 |
| Koichu, Boris | Technion-Israel Institute of Technology | 2004 |
| Koidan, Ruth | The George Washington University | 1969 |
| Koike, Masao | ||
| Koike, Takaaki | University of Waterloo | 2020 |
| Koike Quintanar, Sergio Hiroki | University of Primorska | 2015 |
| Koile, Kimberle | Massachusetts Institute of Technology | 2001 |
| Koiller, Jair | University of California, Berkeley | 1975 |
| Koiller, José | New York University | 2008 |
| Koines, Andrew | University of California, Irvine | 1999 |
| Koirala, Sanjeev | Universität der Bundeswehr München | 2024 |
| Koiran, Pascal | École Normale Supérieure de Lyon | 1993 |
| Koissi-Kouassi, Marie-Claire | Åbo Akademi University | 2006 |
| Koistinen, Petri | Teknillinen korkeakoulu | 1996 |
| Koïta, Mahamet | Université de Bordeaux | 2021 |
| Koïta, Mahamet | Université de Ségou | 2021 |
| Koiter, Warner | Technische Universiteit Delft | 1945 |
| Koivisto, Juhani | Helsingin yliopisto | 2016 |
| Koivo, Heikki | ||
| Koivunen, Visa | Oulun yliopisto | 1993 |
| Koivusalo, Henna | Oulun yliopisto | 2013 |
| Koizumi, Eiko | University of Utah | 2003 |
| Koizumi, Masatoshi | Massachusetts Institute of Technology | 1995 |
| Koizumi, Tetsunori | Brown University | 1970 |