Karol Beck (born 3 April 1982) is a male former tennis player from Slovakia, who turned professional in 2001.

Beck reached the fourth round of the 2004 US Open and the quarterfinals of the 2005 Montreal Masters, defeating Nikolay Davydenko en route to both runs.

On 25 October 2004, Beck lost in the final of the St. Petersburg Open to Mikhail Youzhny 6–2, 6–2.

On 13 February 2006 the International Tennis Federation (ITF) announced Beck had tested positive for the beta agonist clenbuterol during the 2005 Davis Cup semifinal for Slovakia against Argentina, which Slovakia won 4–1.

[1] Beck finished serving his suspension and began playing again in November as an unranked player.