Radek Štěpánek (born 27 November 1978 in Karviná) (Czech pronunciation: ) is a professional tennis player from the Czech Republic.
Štěpánek turned professional in 1997. He started on tour as a doubles specialist, winning 12 ATP titles. Since 2002, Štěpánek has focused on being a better singles player while still playing top-level doubles. He is known for his after the shot grunting, his over the top celebrations and his many relationships with WTA players.
Štěpánek first came to mainstream notice when he defeated former world no.1 Gustavo Kuerten in 5 sets on his way to the 3rd round of the 2003 Australian Open.