Mary Ethel is a feminine given name. Notable people with the name include: Mary Ethel Creswell (1879–1960), American academic Mary Ethel Florey (1900–1966), Australian doctor and medical scientist Mary Ethel Hughes (1874–1958), Australian wife of Billy Hughes Mary Ethel Muir Donaldson (1876–1958), British author and photography pioneer Mary Ethel Seaton (1887–1974), British scholar of English literature Mary Ethel Williams Barrett (1913–1951), American artist, art teacher, and museum director