Francois Daniel "Slak" van Wyk (born 30 July 1991) is a South African rugby union player who currently plays as a loosehead prop for the Western Force in the international Super Rugby competition.
Van Wyk was born and raised in the Western Cape and played junior rugby for both Western Province and Boland. He was also a member of the UCT Ikey Tigers side which lifted the 2011 Varsity Cup, playing in all of his side's 9 games and featuring alongside future Western Force team-mate Marcel Brache.
Opportunities at provincial level proved harder to come by and he only managed 2 appearances for Western Province, both of which came during the 2013 Vodacom Cup. This limitation in game time saw him move to Australia to link up with the Perth based Western Force.
For 2014, van Wyk was named as a member of the Force's Wider Training Group alongside Ollie Hoskins, Brad Lacey, Dillyn Leyds and Dylan Sage. He gained his first Super Rugby cap on 24 May 2014, replacing Pek Cowan in the final minute of his side's 29-19 win over the Lions in Perth.