Michael Des Barres is restaurateur in The Smelly Car (Season 4 Episode 21).

Michael Fairman is Mr. Penske (the owner of Penske file) in The Barber (Season 5 - Episode 8).

Michael James McDonald is Jesse in The Wig Master (Season 7 - Episode 18) and Player in The Understudy (Season 6 - Episode 23).

Michael Laskin is Minkler in The Millenium (Season 8 Episode 20).

Michael Luckerman is Judge in The Secret Code (Season 7 Episode 7).

Michael McShane is Franklin Delano Romanowski in The Betrayal (Season 9 Episode 8).

Michael Milhoan is the security guard in The Stranded (Season 3 Episode 10).

Michael Mitz is Phone Guy in The Chinese Restaurant (Season 2 Episode 11) and Photographer in The Puffy Shirt (Season 5 Episode 2).

Michael Ornstein is Waiter in The Shoes (Season 4 Episode 16).

Michael Richards is a Cosmo Kramer in 170 episodes. In fact, he appears in all but two episodes: The Chinese Restaurant (Season 2 Episode 16) and The Pen (Season 3 Episode 3).

Michael Rivkin is Fulton in The Stand-In (Season 5 Episode 16).

Miguel Pérez is Luis in The Cheever Letters (Season 4 Episode 8).

Miguel Sandoval is Marcelino in The Little Jerry (Season 8 Episode 11).

Mik Scriba is Bomb Squad Guy in The Nap (Season 8 Episode 18).

Mike Hagerty is Rudy, a cabana wear vendor in The Raincoats (Season 5 Episodes 18-19).

Mike Malin is Ball Boy in The Lip Reader (Season 5 - Episode 6).

Mike Robelo is Pop in The Mom and Pop Store (Season 6 Episode 8).

Mike Saad is the Doctor in The Glasses (Season 5 Episode 3).

Mirron E. Willis is Officer #1 in The Beard (Season 6 Episode 16).

Mo Gallini is Tough Guy in The Mom and Pop Store (Season 6 Episode 8).

Neal Lerner is The shusher in The Library (Season 3 Episode 5).

Ned Bellamy is Eddie Sherman in The Fatigues (Season 8 Episode 6).

Neil Flynn is one of the cops in The Summer of George (Season 8 - Episode 22).

Neil Giuntoli is Brody in The Little Kicks (Season 8 Episode 4).

Nicholas Hormann is Calvin Klein in The Pick (Season 4 Episode 13).

Nicholas Mele is Detective in The Bottle Deposit (Season 7 Episode 20).

Nick Bakay is Carl in The Smelly Car (Season 4 Episode 21).