Ruaan Stephen Lerm (born (1992-03-25)25 March 1992 in Kempton Park, South Africa) is a South African rugby union player, currently playing for the Golden Lions. His regular position is number eight or flanker.
He played schools rugby for Hoërskool Dr. E.G. Jansen in Boksburg, which earned him call-ups to a few youth week tournaments for his local Falcons side. In 2008, he was selected in their squad for the Under-16 Grant Khomo Week in Ermelo, which also led to his inclusion in a South African Under-16 Elite squad training group. He then represented the Falcons in two consecutive Under-18 Craven Week competitions; the 2009 competition held in East London and the 2010 competition held in Welkom, where he scored a try in his only appearance against Border.