Peggy Mondo (born Marguerite Gloria Mondo; August 12, 1927 – February 19, 1991) was an American actress. Her early background included training as an opera singer before making her Broadway theatre debut in the 1957 musical The Music Man and later appeared in the 1962 film adaptation. Overweight since childhood, Mondo was typecast into roles that emphasized her obesity. Having little success in losing weight, Mondo eventually embraced her figure and continued to play overweight characters. As well as several films, her work also spanned various television series, including The Addams Family, McHale's Navy, and To Rome with Love. Her career continued into the 1980s with her performance as cousin Tessie in the film Fatso.