Nina (played by Catherine Keener) is the girlfriend of Jerry Seinfeld in Season Three’s “The Letter”. She is an artist and uses Kramer as a subject for her painting. Jerry mentions to George, "She's got like a jealousy thing. I mean, she doesn't like me having fun with anyone but her." She and Jerry break up after an argument about an incident involving Elaine at a Yankee game, after which she sends Jerry a poetic letter that caused Jerry to get back with her again. Later, Jerry finds out that the letter was taken from a Neil Simon play. Jerry tries to confront her later on in the episode, and breaks up with her again.

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