Maggie Egan is Ticket Clerk in The Airport (Season 4 Episode 12).
Margaret Reed is Mary Contardi in The Baby Shower (Season 2 - Episode 10).
Marguerite MacIntyre is Karen Hanson in The Chaperone (Season 6 Episode 1).
Mariska Hargitay is Melissa Shannon in The Pilot (Season 4 Episodes 23-24).
Marla Sucharetza is Nancy Klopper in The Fusilli Jerry (Season 6 - Episode 21).
Marlee Matlin is Laura, a tennis lineswoman. She appears in The Lip Reader (Season 5 Episode 6).
Mary Jo Keenen is Deena Lazzari in three episodes. The first is The Gum (Season 7 - Episode 10).
Maryedith Burrell is Maryedith in The Non-Fat Yogurt (Season 5 Episode 7).
Megan Cole is Peggy in The Susie (Season 8 - Episode 15) and in The Apology (Season 9 - Episode 9).
Megan Mulally is Betsy, the hard of hearing George's girlfriend in The Implant (Season 4 Episode 19).
Melanie Smith is Rachel Goldstein in 3 episodes. The first: The Raincoats (Season 5 Episodes 18-19).
