Klemen Pretnar (born August 31, 1986) is a Slovenian professional ice hockey defenceman who is currently a free agent.
He previously played for HC Košice of the Slovak Extraliga.
In 2012, Pretner signed with EC VSV of the Austrian Hockey League.
On April 15, 2015, Pretnar signed a one-year contract with fellow Austrian club, the Vienna Capitals.He participated at the 2011 IIHF World Championship as a member of the Slovenia men's national ice hockey team.