Cynthia McQuillin (July 25, 1953 – January 14, 2006) was a filk singer and writer as well as an author and artist. She lived in the San Francisco Bay area. Her songs touched the usual filk topics of science fiction, fantasy, and cats, but also feminism, love, Paganism, and Sizeism.
Her life partner and frequent musical collaborator was the filk singer James Robinson, who was then known as Dr. Jane Robinson. McQuillin reportedly said, upon meeting James for the first time, "At last I get to meet the man I fell in love with!"