He was married to the famous actress Tzeni Karezi for 24 years until her death in 1992 at 60 years old. Together they acted in a number of movies, had a son, and were well loved and respected actors. In 1997 he married the actress Jenny Jolia and they now have 3 children. The couple also had a daughter who died in June 1999, when she was 8 month years old.
Kostas Kazakos now in his 84th year, continues to act, and be involved in Greek politics.
- Who's Who (Greek) 1979 p. 226.