Pierre Johan Spies (born 8 June 1985 in Pretoria) is a retired South African rugby union player. He usually plays as a Number 8, but can also play as a flank. Between 2005 and 2015, he spent the majority of his career playing Super Rugby for the Bulls and domestic South African rugby for the Blue Bulls. He also represented South Africa between 2006 and 2013.
Spies was born on 8 June 1985 in Pretoria and attended Afrikaanse Hoër Seunskool (Afrikaans High School for Boys, also known as Affies), a public school located in Pretoria. He attended alongside future Springbok teammates Fourie du Preez and Wynand Olivier, professional rugby players Derick Kuün, Jacques-Louis Potgieter, Gerhard van den Heever, Adriaan Fondse and cricketers AB de Villiers, Heino Kuhn and Faf du Plessis. After school, he completed his first year in B.Sc. Construction Management at the University of Pretoria.
He married Juanne Weidemann, in December 2008. Spies is a devout Christian, but although both his parents are ministers he only started practicing his faith when he was in his twenties.