Kate Mulligan is Party Guest in The Baby Shower (Season 2 Episode 10).

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).

Kathleen McClellan is Melissa in The Apology (Season 9 - Episode 9).

Kathryn Joosten is Betsy in The Little Jerry (Season 8 Episode 11).

Kathryn Kates is Counterwoman in The Dinner Party (Season 5 - Episode 13) and in The Rye (Season 7 - Episode 11).

Kathy Griffin is Sally Weaver in The Doll (Season 7 Episode 17) and in The Cartoon (Season 9 Episode 13).

Katie Layman is Cynthia, the Mentor in The Fatigues (Season 8 Episode 6).

Katy Selverstone is Siena in The Face Painter (Season 6 - Episode 22).

Kellie Waymire is Vivian in The Blood (Season 9 Episode 4).

Kelly Coffield Park is Noreen in The Pledge Drive (Season 6 Episode 3) and in The Chinese Woman (Season 6 Episode 4).

Kim Chase is Charmaine in The Wig Master (Season 7 Episode 18).

Kim Gillingham is Assistant in The Puffy Shirt (Season 5 Episode 2).

Kim Myers is Pam in The Soul Mate (Season 8 Episode 2).

Kim Zimmer is Lenore Walker in The Diplomat's Club (Season 6 - Episode 21).

Kimberley Kates is Diane in The Robbery (Season 1 Episode 3).

Kimberley LaMarque is Teller in Male Unbonding (Season 1 Episode 4).

Kimberley Norris or Kimberley Guerrero is Winona, Elaine's poker friend in The Cigar Store Indian (Season 5 Episode 10).

Kimbely Campbell is Tawni in The Conversion (Season 5 - Episode 11).

Kimberly Kalil is Heather in The Chicken Roaster (Season 8 Episode 8).

Kimberly Newberry is Ms. Jordan in The Maestro (Season 7 Episode 3).

Kristin Bauer is Gillian in The Bizarro Jerry (Season 8 Episode 3).

Kristin Davis is Jenna, Jerry's girlfriend and later Bania's. Her first episode was The Pothole (Season 8 Episode 16).

Lanei Chapman is Sidney Fields' housekeeper in 2 episodes. The first: The Old Man (Season 4 Episode 18).

LaRita Shelby is Tour Leader in The Raincoats (Season 5 Episode 18).

Laura Waterbury is Casting Director in The Pilot (Season 4 Episode 23).

Lauren Bowles is one of the Monk's waitress in 9 episodes. The first is The Apartment (Season 2 Episode 5).