Catherine McWilliams (born 1940) is a visual artist from Northern Ireland.
She and her husband, Joseph McWilliams, opened the Cavehill Gallery in 1986.
She worked as a teacher in Art at Rupert Stanley College until 1990.
McWilliams has been awarded a number of prizes and grants.
Her art is part of the public collections in the Arts Council of Northern Ireland and The National Self Portrait Collection, University of Limerick.