Dinah Lenney (née Mills) is an American actress and writer. She is the author of Bigger than Life: A Murder, a Memoir, a 2007 book about the murder of her father, Republican Party politician and businessman Nelson G. Gross.
Lenney was born to Nelson Gerard and Leah (Binger) Gross in 1956 in Englewood, New Jersey. Her parents divorced in 1958, after which time she lived with her mother, who remarried Ron Lenney. Her surname was legally changed from Gross to Lenney around her sixteenth birthday. She attended Yale University, graduating with a B.A. degree in American Studies in 1978. She received a Certificate of Acting from the Neighborhood Playhouse, where she studied with Sanford Meisner. She also holds a Master of Fine Arts in creative nonfiction from the Bennington Writing Seminars.
In her acting career, Lenney has had a variety of stage, film, and television roles. On television she has appeared on shows such as Murphy Brown, Judging Amy, and South of Nowhere. Since 1995 she has played a recurring role on ER as Nurse Shirley. In 2006 she coauthored the book Acting for Young Actors with Mary Lou Belli.
In 2007 University of Nebraska Press published her memoir, Bigger than Life: A Murder, a Memoir, which recounts her experience of learning that her father, Nelson G. Gross, was kidnapped and murdered in September 1997.