Judge Reinhold is Aaron, the close talker in The Raincoats (Season 5 Episodes 18-19).
Judy Kain is Lorraine Catalano in The Chinese Restaurant (Season 2 - Episode 11).
Julia Campbell is Lisi, the sentence finisher in The Frogger (Season 9 Episode 18).
Julia Louis-Dreyfus is Elaine Benes in all Seinfeld episodes except The Seinfeld Chronicles (Season 1 Episode 1).
Julia Pennington is Celia in The Merv Griffin Show (Season 9 Episode 6).
Julie Claire appears in 4 episodes, three of them as NBC receptionist, and one as Monk's waitress. The first was The Pitch (Season 4 Episode 3).
Julio Oscar Mechoso is Julio in The Kiss Hello (Season 6 Episode 17).
Justine Johnston is Mrs. Armstrong in The Letter (Season 3 Episode 20).
Karen Lynn Scott is «Susie, the Farmer's Daughter» in The Bottle Deposit (Season 7 Episodes 21-22) .
Kari Coleman is Alison in three episodes. The first The Outing (Season 4 - Episode 17).
Karla Tamburrelli is Daphne Bower in The Stand-In (Season 5 Episode 16).
Kate Benton is Woman on the phone in The Chinese Restaurant (Season 2 Episode 11) and Roberta in The Pez Dispenser (Season 3 Episode 14).
Katherine LaNasa is Sergeant Cathy Tierny in The Beard (Season 6 Episode 16).
Kathie Lee Gifford is herself in The Opposite (Season 5 - Episode 22).
Kathryn Kates is Counterwoman in The Dinner Party (Season 5 - Episode 13) and in The Rye (Season 7 - Episode 11).