Patience Cleveland is Robin's mother in The Fire (Season 5 Episode 20).
Patricia Ayame Thomson is Susie in The Apartment (Season 2 - Episode 5).
Patricia Lee Willson is Sara in The Cheever Letters (Season 4 Episode 8).
Patrick Bristow is Ethan, the Wig Master in The Wig Master (Season 7 Episode 19).
Patrick Cronin is Sid Farkus in The Sniffing Accountant (Season 5 Episode 4) and in The Doorman (Season 6 Episode 18).
Patrick Warburton is David Puddy, Elaine most dated boyfriend. He appears in 10 episodes. The first The Fusilli Jerry (Season 6 Episode 20).
Patrika Darbo is Glenda in The Revenge (Season 2 - Episode 7) and woman in mailbox in The Sniffing Accountant (Season 5 - Episode 4).
Peggy Lane O'Rourke appears in eleven Seinfeld episodes. The first: The Suicide (Season 3 - Episode 15).
Peter Crombie is Crazy Joe Davola, in five Seinfeld episodes. The first: The Pitch (Season 4 - Episode 3).
Peter Keleghan is the first Lloyd Braun in The Non-Fat Yogurt (Season 5 - Episode 7).