14 Famous Stars You Forgot Appeared on ‘Seinfeld’

Even devoted Seinfeld fans may be surprised by how many famous actors and comedians made guest appearances throughout the series. Some were already stars, while others were just getting started. Here’s a look back at 14 memorable cameos that helped make the beloved sitcom even more iconic.

Megan Mullally

Before Will & Grace, Megan Mullally appeared as one of the series’ many memorable girlfriends. Her quirky charm shone through, foreshadowing the sharp comedic style she’d later bring to her role as Grace’s wealthy sidekick Karen Walker, a part that earned her two Emmy Awards in a Comedy Series.

Teri Hatcher

Teri Hatcher made a splash in Seinfeld history with one of the most quotable guest appearances ever. Her turn as the “real and spectacular” Sidra left fans with a classic line that still gets repeated decades later, as reported by The Hollywood Reporter.

Lori Loughlin

After Full House fame, Lori Loughlin stepped into Jerry’s orbit in a notable guest role, encouraging Jerry to express his emotions — which ended up leading to their breakup.

Marisa Tomei

Marisa Tomei found herself entangled in one of George Costanza‘s most hilarious plots. Tomei, who had previously won the Academy Award for Best Supporting Actress for her comedic performance in My Cousin Vinny, played a fictionalized version of herself.

Jon Favreau

Long before directing blockbusters, Jon Favreau had a blink-and-you’ll-miss-it Seinfeld cameo. This appearance was just the start for Favreau, who would go on to star in and direct the Iron Man franchise, with Iron Man and Iron Man 2 grossing a combined $1.3 billion at the worldwide box office, per the Hollywood Walk of Fame.

Courteney Cox

Before getting her breakthrough role on Friends, Courteney Cox had a stint as Jerry’s pretend wife. Her down-to-earth comedic timing added a refreshing dynamic to the cast during her appearance.

Jane Leeves

Jane Leeves, beloved as Daphne on Frasier, charmed fans with her four-episode Seinfeld guest spot as “Marla the virgin.”

Lauren Graham

Lauren Graham played Jerry’s speed-dial ranking girlfriend on Seinfeld, showing off the humor and charm she would become famous for when taking on the lead role of Lorelai on Gilmore Girls in 2000.

Carol Kane

Taxi alum and Emmy winner Carol Kane made a memorable guest appearance on Seinfeld as Corinne in season 5, bringing her signature quirky comedy to the hit sitcom.

Judge Reinhold

Judge Reinhold also left his mark on Seinfeld with a memorable cameo as “close talker” Aaron. His over-the-top, deadpan delivery fit seamlessly with the show’s offbeat humor.

Jon Lovitz

Jon Lovitz, known for his pathological liar character on Saturday Night Live, played a similar part on the sitcom – his character faked having cancer!

Jon Voight

Jon Voight made a memorable cameo as a fictional version of himself, becoming the center of one of the show’s funniest running jokes after George is led to believe he purchased the actor’s car.

James Spader

James Spader‘s smug, self-assured portrayal of Jason Hanky fit perfectly with the show’s offbeat humor and made the character a standout.

Bette Midler

Bette Midler made a memorable guest appearance as herself in the season 6 finale, in which Jerry’s girlfriend is her Broadway understudy. Her performance showcased her comedic timing and added an extra dose of star power to one of the show’s most memorable episodes.