| Len Massyn | |
| Fullname: | Willem Leon Massyn |
| Birth Date: | 21 May 1997 |
| Birth Place: | Pretoria, South Africa |
| School: | Monument High School |
| Position: | Flanker / Number 8 |
| Youthyears1: | 2013–2018 |
| Years1: | 2017–2021 |
| Apps1: | 24 |
| Points1: | 10 |
| Years2: | 2018–2021 |
| Apps2: | 16 |
| Points2: | 0 |
| Years3: | 2018–2019 |
| Apps3: | 10 |
| Points3: | 0 |
| Years4: | 2021– |
| Repyears1: | 2017 |
| Repteam1: | South Africa Under-20 |
| Repcaps1: | 3 |
| Reppoints1: | 0 |
| Clubupdate: | 8 September 2021 |
| Repupdate: | 21 May 2018 |
Willem Leon Massyn (born 21 May 1997) is a South African rugby union player for the in Super Rugby, the in the Currie Cup and the in the Rugby Challenge. In 2013 and 2014 he represented the Hoerskool Monument Lions in the Grant Khomo Week and Craven Week. His regular position is flanker or number eight.[1]