Nikolaos "Nikos" Deligiannis (Greek: Νικόλαος Δεληγιάννης, born 3 September 1976 in Athens) is a Greek former water polo player who competed in the 2000 Summer Olympics (10th place), the 2004 Summer Olympics (4th place), the 2008 Summer Olympics (7th place) and the 2012 Summer Olympics (9th place) 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.