Maureen O'Sullivan was an Irish actress.
Maureen O'Sullivan may also refer to:
- Maureen O'Sullivan (politician) (born 1951), Irish independent politician
- Maureen O'Sullivan (spy) (1918–1994), member of the Special Operations Executive
- Maureen Donovan O'Sullivan (1886–1966), historian
- Maureen O'Sullivan (psychologist), see Wizards Project