| JJ van der Mescht | |
| Fullname: | Juan John van der Mescht |
| Birth Date: | 4 May 1999 |
| Birth Place: | Pretoria, South Africa |
| School: | Glenwood High School |
| Position: | Lock |
| Youthyears1: | 2014–2019 |
| Years1: | 2018 |
| Apps1: | 4 |
| Points1: | 0 |
| Years2: | 2018–2021 |
| Apps2: | 9 |
| Points2: | 5 |
| Years3: | 2019–2021 |
| Apps3: | 10 |
| Points3: | 5 |
| Years4: | 2021– |
| Apps4: | 44 |
| Points4: | 20 |
| Repyears1: | 2017 |
| Repteam1: | South Africa Schools |
| Repcaps1: | 3 |
| Reppoints1: | 0 |
| Repyears2: | 2019 |
| Repteam2: | South Africa U20 |
| Repcaps2: | 5 |
| Reppoints2: | 15 |
| Clubupdate: | 11 August 2023 |
| Repupdate: | 11 August 2023 |
Juan John van der Mescht (born 4 May 1999) is a South African rugby union player for the in Super Rugby and in the Currie Cup and the in the Rugby Challenge. His regular position is lock.
JJ is known for his powerful and aggressive style of play, this is helped by his intimidating stature and physical prowess.