Margaret Ellen Mullen (née Goodyear; June 11, 1917 – October 2, 2009) was an American antiwar activist who was motivated to protest after her son was killed in Vietnam by shrapnel fired from friendly artillery in 1970. She became an active opponent of U.S. involvement in the Vietnam War and protested against the Gulf War and Iraq War. Her life story was made into the Emmy Award-winning 1979 film Friendly Fire starring Carol Burnett, which was based on a 1976 book of the same name by C. D. B. Bryan.