Margaret Nagle is a screenwriter, producer, and activist. She has been nominated for three Emmy Awards and won three Writers Guild of America Awards.

Warm Springs is a 2005 made-for-television biography drama film directed by Joseph Sargent, written by Margaret Nagle, and starring Kenneth Branagh, Cynthia Nixon, Kathy Bates, Tim Blake Nelson, Jane Alexander, and David Paymer. The screenplay concerns U.S. President Franklin D. Roosevelt's 1921 illness, diagnosed at the time as polio, his struggle to overcome paralysis, his discovery of the Warm Springs resort, his work to turn it into a center for the rehabilitation of polio victims, and his resumption of his political career. Roosevelt's emotional growth as he interacts with other disabled people at Warm Springs prepares him for the challenges he will face as president during the Great Depression.