Jami Gertz (born October 28, 1965 in Chicago, Illinois) is an American actress. From 2002 until 2006, she starred in the CBS sitcom Still Standing.

She is also best known for her early roles in the movies The Lost Boys, Less Than Zero and the short-lived 1980s TV series Square Pegs with Sarah Jessica Parker. Gertz also had supporting roles in the 1996 blockbuster Twister, the 1984 teen film Sixteen Candles, the 1986 film Crossroads and a 1994 episode of Seinfeld (as a girlfriend of Jerry's who is also both Kramer's phone-sex partner and Elaine's toilet-paper-hogging nemesis).

Gertz made her film debut (along with Tom Cruise) in the 1981 romance film Endless Love. In 2002, Gertz played the late comedic legend Gilda Radner in the television movie Gilda Radner: It's Always Something.

She played the lead role in the 2005 TV film Fighting the Odds: The Marilyn Gambrell Story.

Gertz, who is Jewish, now lives in Los Angeles with her husband Antony Ressler (since 1995) and their three sons: Oliver, Nicholas, and Theo.