Twelve new episodes are set to begin production in Vancouver this summer, to premiere on Showtime early 2008.
"The L Word is a signature franchise for us and one of our most popular series," says Greenblatt.
"This season's guest star Cybill Shepherd and new series regular Marlee Matlin are indicative of the show's great quality."
Premise of the series follows a group of Los Angeles-based friends as they navigate careers, families, friendships, inner-struggles and romantic entanglements.
Ancillary products include "The L Word" branded perfume and jewelry.