Nikolaos "Nikos" Deligiannis is a Greek former water polo player who competed in the 2000 Summer Olympics, the 2004 Summer Olympics, the 2008 Summer Olympics and the 2012 Summer Olympics with the Greece men's national water polo team. He was also part of the Greece national squad who won the Bronze Medal in the 2005 World Championship in Montreal and the Bronze Medal in the 2004 World League in Long Beach.