Igor Zelenay (; born 10 February 1982) is a Slovak former professional tennis player who was a doubles specialist. He reached a career-high ranking of world No. 50 in July 2009. His career-high singles ranking is No. 279, achieved in August 2005. Zelanay has won one ATP Tour title and finished runner-up at four other ATP tournaments.
Zelenay reached his first ATP doubles final at the 2010 Delray Beach International Tennis Championships, where he and his partner Philipp Marx lost in straight sets to the Bryan brothers.
Zelenay announced his retirement in December 2024.