Mary Margaret "Peggy" O'Shea (October 3, 1922 – May 1, 2014) was an American screenwriter.
She wrote primarily for daytime soap operas.
Born in Niagara Falls, New York, O'Shea began writing for television with her former husband Lou Shaw for such series as Dr. Kildare, Ben Casey, and Have Gun – Will Travel.
She and her husband Lou wrote the script of "The Pearl Necklace" (with Hazel Court and Edward Truex), for a 1961 episode of Alfred Hitchcock Presents.
This article about a television writer from the United States is a stub.