Jason Jullian van Rooyen (born 4 February 1997) is a South African athlete who competes in the shot put.
At the 2014 Summer Youth Olympics in Nanjing, China, van Rooyen threw personal bests of 19.73m in qualifying[2] and then 19.82m in the final, finishing fourth overall.
[3] He competed in Taipei at the Athletics at the 2017 Summer Universiade – Men's shot put qualifying for the final with a throw of 18.90m who he didn’t better.
[4] He competed in Naples and the Athletics at the 2019 Summer Universiade – Men's shot put, finishing sixth with a throw of 19.53m.
[5] Van Rooyen won on 29 April 2021 in Potchefstroom with a distance of 21.14 metres, qualifying for the delayed 2020 Tokyo Olympic Games.