Kevin McDonald is Steve (Denim Vest) in The Strike (Season 9 Episode 10).

Kevin Page is Stu Chermack in five episodes. The first The Pitch (Season 4 Episode 3).

Kevin Steinberg is Waiter in The Andrea Doria (Season 8 Episode 10).

Kieran Mulroney is Timmy in The Implant (Season 4 Episode 19).

Kyle Gass is Smoker in The Abstinence (Season 8 Episode 9).

Kyle T. Heffner is Gene, the bizarro George, in The Bizarro Jerry (Season 8 - Episode 3).

Lane Davies is Mackenzie in The Pie (Season 5 - Episode 15).

Larry B. Scott is Arthur Milano in The Slicer (Season 9 - Episode 7).

Larry Charles is Stinky Man in The Airport (Season 4 Episode 12).

Larry David is the co-creator of Seinfeld, and Frank Costanza's lawyer in The Chinese Woman (Season 6 Episode 4).

Larry Hankin is Tom Pepper who played Kramer in Jerry pilot in The Pilot (Season 4 Episodes 23-24).

Larry Miller is the doorman who works at Mr. Pitt's apartment building in The Doorman (Season 6 Episode 18).

Larry Polson is Homeless Guy in The Bottle Deposit (Season 7 Episode 20).

Larry Thomas is Yev Kassem in The Soup Nazi (Season 7 Episode 6).

Lawrence A. Mandley is Larry, Monk's manager in 6 episodes. The first The Outing (Season 4 Episode 17).

Lawrence LeJohn is Fireman in The Fire (Season 5 Episode 20).

Lawrence Taylor is Himself in The Masseuse (Season 5 Episode 9).

Lawrence Tierney is Alton Benes in The Jacket (Season 2 Episode 3).

Lee Arenberg is Mike Moffit in The Parking Space (Season 3 - Episode 21) and in The Susie (Season 8 - Episode 15).

Len Lesser is the Uncle Leo in 14 episodes. The first: The Pony Remark (Season 2 Episode 2).

Leon Russom is Clayton in The Hot Tub (Season 7 - Episode 5).

Leonard Termo is Joe in The Mango (Season 5 Episode 1).

Lewis Arquette is Leapin' Larry in The Secret Code (Season 7 Episode 7).

Lewis Dauber is Doorman in The Watch (Season 4 - Episode 6).

Lionel Mark Smith is the flower guy in The Gum (Season 7 Episode 10).

Lloyd Bridges is Izzy Mandelbaun in The English Patient (Season 8 Episode 17) an in The Blood (Season 9 Episode 4).

Lou Cutell is Dr. Howard Cooperman in The Fusilli Jerry (Season 6 Episodes 21).