Karel Zelenka (born March 31, 1983) is a Czech-Italian former competitive figure skater.

He is a five-time (2003–2007) Italian national champion and competed at the 2006 Winter Olympics.

In October 2001, he won the silver medal at his JGP assignment in Poland.

Zelenka won the first of his five consecutive senior national titles in the 2002–03 season.

He reached the free skate at the 2003 European Championships in Malmö but was eliminated after the short program at the 2003 World Championships in Washington, D.C. Zelenka competed at the 2006 Winter Olympics in Turin; he placed 25th in the short program and missed qualifying to the free skate by one spot.