Jim Fowler is Himself in The Merv Griffin Show (Season 9 Episode 6).

Jim J.Bullock is the male attendant in The Airport (Season 4 Episode 12).

Jimmy Bridges is Paramedic in The Jimmy (Season 6 Episode 19).

Joe Lala is Priest in The Face Painter (Season 6 Episode 22).

Joe Ochman is Customer in The Scofflaw (Season 6 Episode 13).

Joe Urla is Dugan. He appears in six Seinfeld episodes. The first: The Foundation (Season 8 - Episode 1).

Joel McCrary is Don in The Dealership (Season 9 Episode 11).

Joel Polis is Reilly in The Comeback (Season 8 Episode 13).

John Apicella is Repairman in The Tape (Season 3 Episode 8).

John Bishop is Ticket Man in The Masseuse (Season 5 Episode 9).

John Capodice is Vic the laundry machines owner in The Revenge (Season 2 - Episode 7).

John Cothran is Man in The Diplomat's Club (Season 6 - Episode 21).

John D'Aquino is Todd Gack in The Calzone (Season 7 Episode 20).

John Del Regno is Manager in The Busboy (Season 2 Episode 12).

John F. O'Donohue is Gus in The Beard (Season 6 - Episode 15).

John Gabriel is the Newscaster in The Non Fat Yogurt (Season 5 Episode 7).

John Hillner is Greeny in The Revenge (Season 2 Episode 7).

John Kapelos is Barry Prophet, the sniffing accountant in The Sniffing Accountant (Season 5 Episode 4).

John Lizzi is the other guy (the third tenor) in The Doll (Season 7 - Episode 16).

John Michael Higgins is Kurt, Elaine's boyfriend in The Little Jerry (Season 8 Episode 11).

John O’Hurley is Jacopo Peterman. He appears in 20 episodes. The first is The Understudy (Season 6 Episode 23).

John Paragon is Cedric in 3 episodes. First: The Soup Nazi (Season 7 Episode 6).

John Posey is Dr. Fein (Dr. Tongue) in The Heart Attack (Season 2 Episode 8).

John Putch is Roy in The Stranded (Season 3 Episode 10).

John Randolph was the first Frank Costanza in the original version of The Handicap Spot (Season 4 Episode 22).

John Riggi is Bank Teller in The Invitations (Season 7 Episode 22).

John Rubano is Man in The Postponement (Season 7 Episode 2).