Molly Hagan is Sister Roberta in The Conversion (Season 5 Episode 11).

Molly Shannon is Sam in The Summer of George (Season 8 Episode 22).

Monica Lacy is Julie in The Yada Yada (Season 8 - Episode 19).

Montrose Hagins is Betty in The Junk Mail (Season 9 Episode 5).

Nancy Balbirer is Woman at Party in The Mom and Pop Store (Season 6 Episode 8).

Nancy Lenehan is volunteer for the United Volunteer in The Handicap Spot (Season 4 Episode 22).

Nancy Linehan Charles is Woman Executive in The Comeback (Season 8 Episode 13).

Neal Lerner is The shusher in The Library (Season 3 Episode 5).

Ned Bellamy is Eddie Sherman in The Fatigues (Season 8 Episode 6).

Neil Flynn is one of the cops in The Summer of George (Season 8 - Episode 22).

Neil Giuntoli is Brody in The Little Kicks (Season 8 Episode 4).

Nicholas Hormann is Calvin Klein in The Pick (Season 4 Episode 13).

Nicholas Mele is Detective in The Bottle Deposit (Season 7 Episode 20).

Nick Bakay is Carl in The Smelly Car (Season 4 Episode 21).

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).

Nina Tremblay is Jerry's Girlfriend in The Keys (Season 3 Episode 22).

Noelle Balfour is The Portuguese Waitress in The Abstinence (Season 8 Episode 9).

Noor Shic is Usha in The Betrayal (Season 9 Episode 8).

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).

Nurit Koppel is Rava in The Statue (Season 2 Episode 5).

O-Lan Jones is the waitress in The Bubble Boy (Season 4 Episode 7).

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).