Garn Gaynell Stephens[1] (November 7, 1944 – April 2, 2023) was an American film, television, stage, and musical theatre actress, and, later, a screenwriter.

She was known for her roles in the television series Phyllis and the 1982 horror film Halloween III: Season of the Witch.

The following year, Stephens received a leading role on the Golden Globe-winning television sitcom Phyllis with Cloris Leachman, the second spin-off from The Mary Tyler Moore Show.

From the late seventies until the early nineties, Stephens appeared in several top-rated television series, including Charlie's Angels, Family Ties, Falcon Crest, and Quantum Leap.

She is best known for her role as Marge Guttman in the 1982 horror film Halloween III: Season of the Witch, which also starred her then-husband Tom Atkins.