Zachary Porthen (born 31 March 2004) is a South African professional rugby union player, who plays for , the and South Africa. His preferred position is prop.
Porthen attended Wynberg Boys' High School where he played for the first XV and was Head Prefect. He captain SA Schools in 2022, and in 2023 and 2024 represented South Africa at U20 level.
Porthen came through the academy, signing his first professional contract in 2023. He made his Currie Cup debut for the in 2024 and represented the team again in 2025. He made his debut for the Stormers in the 2024âÂÂ25 United Rugby Championship against the .
In October 2025, he was called into the South Africa squad for the 2025 end-of-year rugby union internationals.