Sheila Callaghan (born 1973) is a playwright and screenwriter who emerged from the RAT (Regional Alternative Theatre) movement of the 1990s. She has been profiled by American Theater Magazine, "The Brooklyn Rail", Theatermania, and The Village Voice. Her work has been published in American Theatre magazine. In 2010, Callaghan was profiled by Marie Claire as one of "18 successful women who are changing the world." She was also named one of Variety magazine's "10 Screenwriters to Watch" of 2010. She was nominated for a 2016 Golden Globe Award for her work on the Hulu comedy series Casual, and a 2017 WGA nomination for her episode "I Am A Storm" from Season 7 of the comedy/drama series Shameless.