Lois Arlene Smith (née Humbert; born November 3, 1930) is an American actress. She made her film debut in the 1955 drama film East of Eden, and later played supporting roles in a number of movies, including Five Easy Pieces (1970), Resurrection (1980), Fatal Attraction (1987), Fried Green Tomatoes (1991), How to Make an American Quilt (1995), Dead Man Walking, Twister (1996), Minority Report (2002), The Nice Guys (2016) and Lady Bird (2017).

In 2017, Smith received critical acclaim for her leading performance in the science-fiction drama film Marjorie Prime, for which she was nominated for an Independent Spirit Awards, Gotham Awards and Saturn Award, and well as won Satellite Award. Smith also has had many roles on television, both daytime and prime time. She was regular cast member in the HBO horror drama True Blood, and well as received Critics' Choice Television Award for Best Guest Performer in a Drama Series nomination for The Americans.