Nikola Rađen (, ) (born 29 January 1985) is a Serbian water polo player who plays for Serbian club Crvena zvezda. He was a member of the Serbia men's national water polo team at the 2008 Beijing Olympics. He won with Serbia the 2009 World Championship as well as the 2012 Eindhoven European Championship. Rađen has also won 2 LEN Euroleagues with his former clubs Partizan Raiffeisen (2011) and VK Crvena zvezda (2013).