There are 20 mathematicians whose last name begin with HAP.
| Hapanyengwi, Gilford | Vanderbilt University | 1993 |
| Hapka, Alexander | New York University | 1989 |
| Happ, Alex | University of Kentucky | 2018 |
| Happ, Edda | Universität des Saarlandes | 2008 |
| Happ, Martin | Universität Salzburg | 2020 |
| Happ, Sebastian | Universität Hamburg | 2014 |
| Happach, Felix | Technische Universität München | 2020 |
| Happacher, Maximillian | Universität Augsburg | 1996 |
| Happe, Hans | University of Southern Denmark | 2007 |
| Happel, Dieter | Universität Bielefeld | 1980 |
| Happel, H. | ||
| Happel, Hans-Jörg | Karlsruher Institut für Technologie (KIT) | 2017 |
| Happel, John | ||
| Happel, Stephen | Duke University | 1976 |
| Happenhofer, Marco | Technische Universität Wien | 2011 |
| Happenhofer, Natalie | Universität Wien | 2014 |
| Happle, Wolfgang | Karlsruher Institut für Technologie (KIT) | 1985 |
| Häppölä, Juho | King Abdullah University of Science and Technology | 2017 |
| Hapuarachchi, Sujeewa | University of Louisville | 2017 |
| Hapuhinna, Nelum | Bowling Green State University | 2021 |