- Michael M. Robin
- (12 episodes, 2003-2006)
- Elodie Keene
- (11 episodes, 2003-2010)
- Ryan Murphy
- (8 episodes, 2003-2006)
- Charles Haid
- (8 episodes, 2006-2008)
- Craig Zisk
- (7 episodes, 2003-2010)
- John Scott
- (6 episodes, 2009-2010)
- Nelson McCormick
- (4 episodes, 2003-2006)
- Sean Jablonski
- (4 episodes, 2006-2009)
- Richard Levine
- (4 episodes, 2006-2009)
- Brad Falchuk
- (4 episodes, 2007-2009)
- Dirk Craft
- (4 episodes, 2008-2010)
- Jamie Babbit
- (3 episodes, 2003-2004)
- Greer Shephard
- (3 episodes, 2004-2005)
- Lynnie Greene
- (3 episodes, 2006-2009)
- Tim Hunter
- (3 episodes, 2009-2010)
- Scott Brazil
- (2 episodes, 2003-2004)
- Jeremy Podeswa
- (2 episodes, 2005)
- Hank Chilton
- (2 episodes, 2009-2010)
- Tate Donovan
- (2 episodes, 2009-2010)
- Lawrence Trilling
- (1 episode, 2003)
- Guy Ferland
- (1 episode, 2005)
- David Nutter
- (1 episode, 2005)
- Greg Yaitanes
- (1 episode, 2005)
- Patrick McKee
- (1 episode, 2006)
- Jesse Bochco
- (1 episode, 2009)
- Eric Stoltz
- (1 episode, 2009)
- Diana Valentine
- (1 episode, 2010)