•
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) •
Mary Jean Simpson, American scholar and public servant •
Mollie Evans (1922-2016), British antique dealer, born Mary Simpson ==Characters==