There are 32 mathematicians whose last name begin with CY.
| Cybenko, George | Princeton University | 1978 |
| Cybis, Gabriela | University of California, Los Angeles | 2014 |
| Cybo-Ottone, Alberto | New York University | 1993 |
| Cycon, Hans | Technische Universität Berlin | 1979 |
| Cyert, Richard | Columbia University | 1952 |
| Cygan, Ewa | Uniwersytet Jagielloński | 1997 |
| Cymbalyuk, Gennady | Russian Academy of Sciences | 1996 |
| Cymberknop, Leandro | Universidad Tecnológica Nacional | 2013 |
| Cynk, Sławomir | Uniwersytet Jagielloński | 1992 |
| Cynn, Myong | University of Illinois at Urbana-Champaign | 1994 |
| Cypher, Robert | University of Washington | 1989 |
| Cyphert, Daniel | Vanderbilt University | 1982 |
| Cyphert, John | University of Wisconsin-Madison | 2023 |
| Cyr, Bryce | McGill University | 2022 |
| Cyr, Christopher | University of Florida | 2017 |
| Cyr, Derek | State University of New York at Albany | 2010 |
| Cyr, Eric | University of Illinois at Urbana-Champaign | 2008 |
| Cyr, Joseph | State University of New York at Binghamton | 2019 |
| Cyr, Justin Russell | Indiana University | 2018 |
| Cyr, Van | The Pennsylvania State University | 2010 |
| Cyranek, René | Ludwig-Maximilians-Universität München | 2013 |
| Cyranka, Jacek | Uniwersytet Jagielloński | 2013 |
| Cyranski, John | University of Wisconsin-Milwaukee | 1974 |
| Cyrier, Michelle | Harvard University | 2006 |
| Cyrus, Saman | University of Wisconsin-Madison | 2021 |
| Cyrus, Teresa | University of California, Berkeley | 1997 |
| Cyrus, Vivian | University of Kentucky | 1994 |
| Cysneiros, Audrey Helen | Universidade de São Paulo | 2004 |
| Cysneiros, Francisco | Universidade de São Paulo | 2004 |
| Cysouw, Hendrik | Universiteit Leiden | 1934 |
| Cytron, Ronald | University of Illinois at Urbana-Champaign | 1984 |
| Cytrynbaum, Eric | University of Utah | 2001 |