Larry David is an American actor and comedian who is probably best known as the co-creator (along with Jerry Seinfeld), executive producer, and frequent writer of Seinfeld. He was the inspiration for the character George Costanza. Many of the episodes stem from his personal experience doing stand-up and writing on Saturday Night Live and its early counterpart, Fridays, working with Michael Richards, Melanie Chartoff, and Bruce Mahler. At the end of Season Seven, Larry left, but he returned to write "The Finale". He did, however, voice certain characters in later seasons. After Seinfeld, he went on to create and star in another popular sitcom, Curb Your Enthusiasm. Larry makes many voice and appearing cameos in the shows throughout the series, most notably as the voice of George Steinbrenner. He also appears as Frank Costanza's Lawyer wearing a cape. Larry appeared in the first episode of Jerry Seinfeld's 2012 comedy web series Comedians in Cars Getting Coffee.
- Cashier who refused George's $20 because of lipstick on President Jackson's mouth
- Provided the voice of Newman in “The Revenge”.
- Space cadet on Jerry's TV set yelling about the doom of his planet (Flaming Globes of Sigmund) in “The Heart Attack”
- Voices a coach class passenger complaining about not getting a kosher meal
- Voices coming movie attractions in an episode
- Greenpeace volunteer in a lifeboat with the former NBC president
- Voice of one of the diners at "The Chinese Restaurant"
- When Kramer goes to California, Larry is seen in the background when Kramer is being arrested at his apartment.
- Improvisation club announcer. In one episode he is heard saying, “Tommy, you’re on.”
- Beachgoer who says, “Is anyone here a marine biologist?”
- Voices a cop while Kramer is having is mugshot taken in "The Wig Master." David's lines include, "Okay, Big Daddy. Take the hat off," as well as "I said, 'Turn' pimp!" (Kramer was under arrest on suspicion of being a pimp.)
- Angry retiree who asks Jerry, “Who are you?” He later yells, “I’d rather have a bottle of scotch!” ("The Pen")
- Voiced one of the people who shouted at Kramer in "The Switch"; he said, "What do you say, Cosmo?"
- and countless others.