Nick Jameson is Horst in The Doorman (Season 6 Episode 18).

Nick LaTour is Grandpa in The Wife (Season 5 Episode 17).

Nigel Gibbs is a tenant in Mr. Pitt's building in The Doorman (Season 6 - Episode 18).

Norman Brenner appears in twenty-nine Seinfeld episodes. The first: The Stakeout (Season 1 - Episode 2).

Norman Large is Detective in The Friars Club (Season 7 Episode 17).

O'Neal Compton is Earl Haffler in The Diplomat's Club (Season 6 - Episode 21) and in The English Patient (Season 8 - Episode 17).

Oscar Jordan is Counterperson in The Opposite (Season 5 Episode 22).

Ossie Mair is Driver in The Andrea Doria (Season 8 Episode 10).

Pat Asanti is Electrician in The Mom and Pop Store (Season 6 Episode 8).

Pat Cooper is Himself in The Friars Club (Season 7 Episode 17).

Pat Finn is Joe Mayo. He appears in The Reverse Peephole (Season 9 Episode 12).

Pat Kilbane is Feldman, the Bizarro Kramer in The Bizarro Jerry (Season 8 Episode 3).

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 Kerr is Lafarge in The Bottle Deposit (Season 7 Episodes 21-22).

Patrick Warburton is David Puddy, Elaine most dated boyfriend. He appears in 10 episodes. The first The Fusilli Jerry (Season 6 Episode 20).

Patton Oswalt is the video store clerk in The Couch (Season 6 Episode 5).

Paul Benedict is Mr. Elinoff in The Cartoon (Season 9 Episode 13).

Paul Gleason is Mr. Cushman in The Opposite (Season 5 - Episode 22).

Paul Mantee is Health Inspector in The Pie (Season 5 Episode 15).

Paul Michael is Mr. Ciccio in The Maestro (Season 7 Episode 3).

Paul Perri is Detective Danner in The Little Jerry (Season 8 Episode 11).

Perry Anzilotti is the Usher in The Movie (Season 4 - Episode 14).

Peter Allas is Mario in The Calzone (Season 7 Episode 19).

Peter Crombie is Crazy Joe Davola, in five Seinfeld episodes. The first: The Pitch (Season 4 - Episode 3).

Peter Dennis is Lew in The Summer of George (Season 8 Episode 22).

Peter Keleghan is the first Lloyd Braun in The Non-Fat Yogurt (Season 5 - Episode 7).