David Fresco is Isaac in The Pony Remark (Season 2 Episode 2).

David Graf is Cop in The Ticket (Season 4 Episode 4).

David James Elliott is Carl in The Couch (Season 6 Episode 5).

David Labiosa is Antonio in The Busboy (Season 2 Episode 12).

David Letterman is Himself in The Abstinence (Season 8 Episode 9).

David Mandel is Frolf Player in The Summer of George (Season 8 Episode 22).

David Moreland is Mr. Parry in The Slicer (Season 9 - Episode 7).

David Moscow is Lomez Jr. in The Van Buren Boys (Season 8 - Episode 14).

David Naughton is Dick in The Red Dot (Season 3 Episode 12).

David Purdham is Dr. Resnick in The Package (Season 8 Episode 5).

David Richardson is Customer in The Barber (Season 5 Episode 8).

David Sage is Dr. Dembrow in The Wallet (Season 4 Episode 5).

David St. James is Doctor in The Secret Code (Season 7 Episode 7).

David Tress is Mr. Cohen in The Chinese Restaurant (Season 2 Episode 11).

Dayton Callie is Cabbie in The Puerto Rican Day (Season 9 - Episode 20).

Dean Hallo is Steve Gendason in The Big Salad (Season 6 Episode 2).

Deck McKenzie appears in thirteen Seinfeld episodes. The first: The Revenge (Season 2 - Episode 7).

Dennis Franz is just a picture in The Bizarro Jerry (Season 8 Episode 3).

Derek Jeter is Himself in The Abstinence (Season 8 Episode 9).

Dom Irrera is Ronnie Kaye in The Fire (Season 5 - Episode 20).

Dom Magwili is Dustin, the tallest of the towel guys in The Pool Guy (Season 7 - Episode 8).

Don McManus is Duncan Meyer in The Race (Season 6 Episode 10).

Don Perry is Bill in The Baby Shower (Season 2 Episode 10).

Donald Bishop is Dr. Allenwood in The Implant (Season 4 Episode 19).

Dorien Wilson is Alec in The Raincoats (Season 5 Episodes 18-19).

Doug Ballard is Manager in The Busboy (Season 2 Episode 12).

Dublin James Wahlberg is Maurice in The Van Buren Boys (Season 8 - Episode 14).