| Ernst van Rhyn | |
| Birth Date: | 19 September 1997 |
| Birth Place: | Bellville, South Africa |
| School: | Paarl Gimnasium |
| University: | University of Stellenbosch |
| Position: | Lock / Flank |
| Currentclub: | / |
| Youthyears1: | 2015–2018 |
| Years1: | 2018–present |
| Apps1: | 41 |
| Points1: | 15 |
| Years2: | 2019–present |
| Apps2: | 37 |
| Points2: | 5 |
| Repyears1: | 2015 |
| Repteam1: | South Africa Schools |
| Repcaps1: | 3 |
| Reppoints1: | 0 |
| Repyears2: | 2016–2017 |
| Repteam2: | South Africa Under-20 |
| Repcaps2: | 9 |
| Reppoints2: | 0 |
| Clubupdate: | 23 July 2022 |
| Repupdate: | 25 August 2018 |
Ernst van Rhyn (born 19 September 1997) is a South African rugby union player for the in Super Rugby and in the Currie Cup and the Rugby Challenge. He can play as a lock or a flank.