Nir Welgreen (born 17 December 1976) is a former professional tennis player from Israel.

Born in 1976, Welgreen began competing in satellite tournaments in the 1992 season.

His best performances on the ATP Tour were second round appearances at both Long Island in 1996 and Tashkent in 1997.

[1] During his career he took part in several grand slam qualifying draws, including the 1999 Wimbledon Championships.

In doubles he had a top 200 ranking and claimed two Challenger titles.