Susan Glaspell (July 1, 1876 – July 27, 1948) was an American playwright, novelist, and journalist, recognized as a pioneer of modern American drama. She co-founded the Provincetown Players, a key force in the Little Theatre Movement, which nurtured talents like Eugene O'Neill. Glaspell's works often explore themes of gender, justice, and individuality, with a focus on women's inner lives. Her most famous play, Trifles (1916), is a feminist classic that examines gender roles through a murder investigation. She also won the Pulitzer Prize for Drama in 1931 for Alison's House. Despite being overlooked for decades, her contributions to theater have been reassessed and celebrated in feminist literary criticism.