How many episodes were in season 4 of Dexter?

12.

There are 12 episodes in the fourth season of the hit Showtime/CBS TV series ‘ËœDexter’â„¢. The season premiered on American TV on September 27, 2009, although it was leaked to the internet in August 2009. The finale for the season aired on December 13, 2009, with a cliffhanger ending resulting in the death of a central character in the series.