Elrigh Louw (born 20 September 1999) is a South African rugby union player for the in the United Rugby Championship and for the in the Currie Cup. He can play as a flanker or a lock.
Louw attended and played rugby for Hoërskool Transvalia, which earned him a selection to the squad for the Under-18 Craven Week. After school, Louw moved to Bloemfontein to join the , representing them at Under-19 and Under-21 level. He was also called up to the South Africa Under-20 squad, representing them at the 2019 World Rugby Under 20 Championship in Argentina.
In 2019, Louw joined the Port Elizabeth-based franchise the . He made his first class debut in the opening round of the 2019–20 Pro14 season, coming on as a replacement their 27–31 defeat to the . In his second appearance the following week, he scored his first senior try in a 20–31 defeat to .