Megan Marshall (born June 8, 1954) is an American scholar, writer, and biographer.
Her first biography The Peabody Sisters: Three Women Who Ignited American Romanticism (2005) earned her a place as a finalist for the 2006 Pulitzer Prize for Biography or Autobiography.
Her second biography Margaret Fuller: A New American Life (2013) is a richly detailed account of Margaret Fuller, the 19th-century author, journalist, and women's rights advocate who perished in a shipwreck off New York's Fire Island. It won the 2014 Pulitzer Prize for Biography or Autobiography.