There are 4 mathematicians whose last name begin with HIO.
| Hion, Jaak | Lomonosov Moscow State University | 1955 |
| Hiong (Xiong), King-Lai (Qinglai) | Université de Paris | 1934 |
| Hioni, Labrini | University of Athens | 2017 |
| Hiorns, Robert | The University of Edinburgh | 1964 |