Didi Conn is an American actress. She is best known for her work as Frenchy in Grease, Denise Stevens Downey in Benson and Stacy Jones in Shining Time Station.

Edith Bernstein was born on July 13, 1951, in Brooklyn, New York. She had a Conservative "holiday Jewish" upbringing.

Conn made her debut as an actress in the 1960s. Her notable characters since the 1970s, when she first became prominent, include Laurie Robinson in You Light Up My Life 1977 Kasey Cisyk provided the character's singing voice), Frenchy in the feature films Grease 1978 and Grease 2 1982, Helen on The Practice 1976–77 Denise Stevens Downey on Benson (1981–84), and Stacy Jones on Shining Time Station 1989–9 She later reprised her role as Shining Time Station manager in Thomas and the Magic Railroad 2000.

In January 2016, she had a cameo as Vi in the Grease: Live television special on Fox, thus being the only actress to appear in all three screen adaptations of the franchise. In addition, she has appeared in numerous other roles on television.

In 2019, Conn was a contestant on the eleventh series of the British television series Dancing on Ice. At 67, she was the oldest person ever to compete on the show. She, alongside her professional partner Łukasz Różycki, were eliminated in Week 4, after the judges saved Saara Aalto and Hamish Gaman in the skate-off.