Ernst van Rhyn (born 19 September 1997) is a South African rugby union player for the in premiership rugby and in the Currie Cup and the Rugby Challenge. He can play as a lock or a flank.
On 16 September 2025, van Rhyn extended his contract with the Sale Sharks until June 2029.
On 23 September 2025, van Rhyn was named captain of the Sale Sharks for the 2025/26 Gallagher Prem season.