Mary Simpson may refer to:

People Mary Simpson (priest) (1925–2011), one of the first women to be ordained an Episcopal priest (1977) Mary Simpson (Northern Ireland politician), unionist politician in Northern Ireland in the 1970s and 1980s Mary Simpson (violinist), violinist known for performing in Yanni's orchestra Mary Elizabeth Simpson (1865–1948), New Zealand religious teacher, healer and writer Mary Ellen Simpson, musician in The Ace of Cups Mary Kell Simpson (1903–1970), South Australian physiotherapist later known as Dorothy Kell Finnis Mary Simpson (house servant) (c.1752–1758 – 1836), African-American woman who claimed to be a former slave of George Washington Mary Jean Simpson (1888–1977), American scholar and public servant Mollie Evans (1922–2016), British antique dealer, born Mary Simpson Mary Simpson Sperry (1833–1921), née Simpson, American suffragist in California Mary Theresa Simpson (1951/1952 – 1964), American girl from Elmira, New York, see killing of Mary Theresa Simpson

Characters Mary Simpson, fictional character in the 1632 book series Mary Simpson, fictional character on the TV series The Andy Griffith Show Mary Simpson, fictional character in the film Two Mafiamen in the Far West