Jarkko Kalervo Nieminen (born July 23, 1981 in Masku, Finland) is a professional tennis player from Finland.
His highest ranking is 13th which was archived on July 10, 2006. He has won one ATP singles title and two doubles titles in his career so far. His best performances in Grand Slam tournaments have been reaching the quarter-finals of the 2005 U.S. Open, 2006 Wimbledon Championships, and the 2008 Australian Open.
Arguably Finland's best ever player, Nieminen is the highest ranked Finn ever, and is also the first and so far only Finnish player to have won an ATP singles title and to have reached the quarter-finals of a Grand Slam event.