There are 13 mathematicians whose last name begin with HAGA.
| Haga, Herman | Universiteit Leiden | 1876 |
| Haga, Joachim | Universitetet i Oslo | 2011 |
| Haga, John | University of Connecticut | 2012 |
| Haga, Karen | Københavns Universitet | 2019 |
| Haga, Steve | University of Maryland College Park | 2005 |
| Haga, Tim | Universität Bremen | 2016 |
| Hagan, Melvin | Oklahoma State University | 1964 |
| Hagan, Patrick | California Institute of Technology | 1979 |
| Hagander, Per | ||
| Hagan, Jr., Robert | Rensselaer Polytechnic Institute | 1982 |
| Hagar, Amit | University of British Columbia | 2004 |
| Hagar, Luke | University of Waterloo | 2024 |
| Hagar, Yolanda | University of California, Davis | 2010 |