Peter Krause is Tim in The Limo (Season 3 Episode 19).

Peter Murnik is Lieutenant Martel in The Trip (Season 4 Episode 1).

Peter Riegert is James Kimbrough in The Finale (Season 9 Episodes 23-24).

Phil Morris is Jackie Chiles in five episodes. The first is The Maestro (Season 7 - Episode 3).

Phillip Baker Hall is Joe Bookman in The Library (Season 3 Episode 5).

Philip Bruns is Morty Seinfeld in The Stakeout (Season 1 Episode 2).

Pierrino Mascarino is Father Hernández in The Face Painter (Season 6 - Episode 22).

Ping Wu is Ping in four episodes. The first The Tape (Season 3 - Episode 8).

Raf Mauro is the car washer in The Smelly Car (Season 4 Episode 21).

Ralph Bruneau is Roy, the dentist in The Note (Season 3 Episode 1).

Ralph Louis Harris is Ralph in The Sniffing Accountant (Season 5 Episode 3).

Ralph Manza is Gepetto in The Cigar Store Indian (Season 5 Episode 10).

Ramón Franco is Mailman in The Package (Season 8 Episode 5).

Rance Howard appears in 2 episodes: 1) The Glasses (Season 5 Episode 3) and 2) The Bottle Deposit (Season 7 Episodes 21-22).

Randy Brenner is Waiter in The Conversion (Season 5 Episode 11).

Randy Carter is Rick in The Abstinence (Season 8 Episode 9).

Ray Proscia is Bobby in The Little Jerry (Season 8 Episode 11).

Ray Stricklyn is Clarence Eldridge in The Andrea Doria (Season 8 Episode 10).

Raye Birk is Mr. Pless in The Face Painter (Season 6 Episode 23).

Raymond O'Connor is the Night Doorman in The Doorman (Season 6 - Episode 17).

Regis Philbin is Himself in The Opposite (Season 5 - Episode 22).

Reni Santoni is Poppie in 4 episodes. The first: The Pie (Season 5 Episode 15).

Reuven Bar-Yotam is Shlomo in The Frogger (Season 9 Episode 18).

Richard Assad is Cabbie in The Boyfriend (Season 3 Episode 17).

Richard Burgi is Ben Pfeffer in The Hamptons (Season 5 Episode 21).

Richard Fancy plays Mr. Lippman, Elaine's boss at Pendant Publishing.

Richard Gant plays Fred, of The Equal Employment Opportunity Commission Office in The Pilot (Season 4 Episode 23).