Kleon Grigoriadis (Athens, June 17, 1965) is a Greek actor, politician and MeRA25 MP.

In the 1991-1992 season, he made his first television appearance with a leading role in the social series "The Trip That Kills" playing alongside Anna Vagena and Tasos Chalkias. This was followed by Mirella Papaikonomou's series "Women" in the 1992-1993 season, while in the 1994-1995 season she starred in the drama series "The eye of the snake". From 1998 to 1999 he made some guest appearances in the second cycle of the series "Married people have souls too". He became more widely known in the 1999-2000 season starring in the highly successful sitcom "Something's Happening Next Door". There he played with Reno Charalambidis, Dimitra Matsoukas and Eleftheria Vidakis, while the script and direction of the series belonged to Vassilis Nemea. Two TV series followed in the next season: "It's Your Fault" on Mega Channel and "The Perfect Man" on Star Channel. In the period 2001-2002 he participated in two stories of Panos Kokkinopoulos' police series "Red Circle". From 2002 to 2003 he starred with Anna Panagiotopoulou and Nena Menti in the comedy series "Patra-Venice". From 2004 to 2005, she participated in the series "Seven Deadly Mother-in-Laws", "Nobody Says I Love You" and "Safe Sex TV Stories" while she starred in the TV movie "Women's Agreements". In the 2005-2006 season he played in the series "The Misfits" and "The Right Moment" while the following season in "Mountain Luck" and "The Stories of Police Becca". In the 2008-2009 season he made a guest appearance in the series "I have a secret" while starring in the series "There are men and men".He returned to television in the 2014-2015 season having one of the leading roles in Dimitris Arvanitis' daily drama series "Justification".

In the cinema he made his first appearance in 1990 starring in the film The Night of the Secret Meeting while in the same year he participated in the short film The Laboratory of Dr. Caligari. This was followed by the film Gray Station in 1991. In 1995 he played in George Panousopoulos' film Freediving. In 1998 he took part in the film Black Out while the following year he participated in the films Female Company and The Discreet Charm of Men. In 2000 he played in the movie Risotto and in 2001 in the movies Stackaman and To be Continued. In 2005 he made a small appearance in the movie Loukoumades me meli. In 2009 he starred in the film Ama de se hale, while in 2013 he starred in Dimitris Arvanitis's film One Night in Athens.