Characters appearing in five or more episodes
Character, # of episodes, Actor/Actress, Character description
Ruthie Cohen 101 Ruth Cohen A cashier at Monk's Caf.
Newman 48 Wayne Knight Fellow tenant in Jerry and Kramer's apartment building.
Frank Costanza 29 John Randolph (first appearance), Jerry Stiller (starts in season 5)[1] George's father.
Estelle Costanza 29 Estelle Harris George's highly obnoxious and melodramatic mother.
Susan Ross 29 Heidi Swedberg Susan was George's on-off girlfriend and later fiance.
Morty Seinfeld 24 Phil Bruns (first appearance), Barney Martin (later appearances) Jerry's father..
Helen Seinfeld 24 Liz Sheridan Jerry's mother.
Jacopo "J." Peterman 22 John O'Hurley
George Steinbrenner 16 Larry David (voice), Mitch Mitchell (in "The Nap" and "The Millennium"), Lee Bear (other appearances) George's boss.
Uncle Leo 15 Len Lesser Jerry's uncle.
Matt Wilhelm 12 Richard Herd George's supervisor at the New York Yankees.
David Puddy 11 Patrick Warburton Elaine's on-again-off-again boyfriend, often referred to and addressed as Puddy.
Mr. Lippman 11 Richard Fancy, Harris Shore (in "The Library") Elaine's boss at Pendant Publishing.
Justin Pitt 8 Ian Abercrombie Elaine's second boss.
Mickey Abbott 7 Danny Woodburn A quick-tempered little person actor. Typically appears with Kramer, with whom he is friends.
Russell Dalrymple 7 Bob Balaban The president of NBC who works with Jerry and George on a television pilot.
Kenny Bania 7 Steve Hytner Stand-up comedian considered a 'hack' by Jerry and other comedians.
Crazy Joe Davola 6 Peter Crombie Writer who suffers from mental problems.
Dugan 6 Joe Urla Co-worker of Elaine at J. Peterman. Thinks that no one should make fun of pigs.
Jackie Chiles 6 Phil Morris Kramer's eccentric but highly effective lawyer.
Larry 6 Lawrence Mandley The manager or owner of Monk's Cafe, sometimes antagonized by the foursome's antics.
Jack Klompus 6 Sandy Baron Short-tempered resident of Phase Two of the Pines of Mar Gables who seems to consistently bear a grudge against Morty Seinfeld.
Tim Whatley 5 Bryan Cranston A dentist that was once dubbed "Dentist to the Stars" by George.
Mr. and Mrs. Ross 5 Warren Frost and Grace Zabriskie Parents of Susan, George's fiance.
When the truth comes out, do not ask me how I knew.
Ask yourself why you did not.
