The Canadian Encyclopedia — neutral, cited, updated
July 26, 2026Sources cited
Canadianwire.
Canada’s encyclopedia & explainer
HomeEntertainmentTV characterCosmo Kramer
Entertainment • TV character

Cosmo Kramer

Cosmo Kramer, usually known simply as Kramer, is a fictional character in the American television sitcom Seinfeld.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Cosmo Kramer, usually known simply as Kramer, is a fictional character in the American television sitcom Seinfeld. He is Jerry Seinfeld’s eccentric next-door neighbour and one of the series’ four central characters, portrayed by Michael Richards. The character was loosely based on Kenny Kramer, a former neighbour of Seinfeld co-creator Larry David.

Character overview

Cosmo Kramer is a fictional character from Seinfeld who appears as Jerry Seinfeld’s neighbour and close friend. He is depicted as unconventional, physically expressive, and often involved in absurd or improvised plans.

Creation and inspiration

The character was loosely based on Kenny Kramer, a former neighbour of Larry David. In early development, the character was known by a different name before settling on Kramer.

Portrayal

Michael Richards played Cosmo Kramer on Seinfeld and became closely associated with the role. Richards’ performance emphasized physical comedy and exaggerated mannerisms.

Cultural impact

Kramer became one of the best-known characters in American television comedy. The role helped define the ensemble dynamic of Seinfeld and is frequently cited in discussions of iconic TV characters.

Key facts

  • Kramer is one of the four main characters of Seinfeld.
  • He is known for his eccentric behaviour and unusual schemes.
  • The character is Jerry Seinfeld’s next-door neighbour.
  • He is also friends with George Costanza and Elaine Benes.
  • Kramer was portrayed throughout the series by Michael Richards.

Frequently asked questions

Who is Cosmo Kramer?
Cosmo Kramer is a fictional character on Seinfeld, known as Jerry Seinfeld’s eccentric neighbour and one of the show’s main characters.
Who played Kramer?
Kramer was portrayed by actor and comedian Michael Richards.
What was Kramer based on?
The character was loosely inspired by Kenny Kramer, a former neighbour of Seinfeld co-creator Larry David.
Is Kramer one of the main characters in Seinfeld?
Yes. Kramer is one of the series’ four central characters, alongside Jerry Seinfeld, George Costanza, and Elaine Benes.
What is Kramer known for?
He is known for eccentric behaviour, unusual ideas, and physical comedy.

References

  1. Wikipediahttps://en.wikipedia.org/wiki/Cosmo_Kramer
    Supports: Character identity, role in Seinfeld, portrayal by Michael Richards, inspiration from Kenny Kramer
  2. Encyclopaedia Britannicahttps://www.britannica.com/topic/Cosmo-Kramer
    Supports: Kramer as Jerry’s neighbour and character description in Seinfeld
  3. Wikipediahttps://en.wikipedia.org/wiki/Michael_Richards
    Supports: Michael Richards portrayed Cosmo Kramer on Seinfeld
  4. Wikipediahttps://en.wikipedia.org/wiki/Kenny_Kramer
    Supports: Kenny Kramer as inspiration for the character