Lois Duncan Steinmetz (April 28, 1934 – June 15, 2016), known as Lois Duncan, was an American writer of children's books. She was best known for young-adult novels of suspense. She wrote two early novels under the pen name Lois Kerry.
Duncan won the 1992 Margaret Edwards Award from the American Library Association for her contribution in writing for teens.
On June 15, 2016, at the age of 82, Duncan died at home in South Sarasota, Florida from complications of a stroke.