Mary Bailey may refer to:
People Mary Bailey (aviator) (1890–1960), British aviator Mary Barbara Bailey (1910–2003), British Roman Catholic Mary Creighton Bailey (1913–2008), British classics scholar and educator Mary Johnson Bailey Lincoln (1844–1921), American teacher and cookbook author
Characters Mary Bailey (Jericho), in the US post-apocalyptic action drama TV series Jericho, played by Clare Carey Mary Bailey (The Simpsons), in the US animated sitcom The Simpsons, voiced by Maggie Roswell and Tress MacNeille Mary Hatch Bailey, in the 1946 US Christmas supernatural drama film It's a Wonderful Life, played by Donna Reed (adult) and Jean Gale (child)