Jill Banner (eigentlich Mary Kathryn Molumby, * 8. November 1946 in Bremerton, Washington; † 7. August 1982 in North Hollywood, Kalifornien) war eine US-amerikanische Schauspielerin. ()
Jill Banner, born Mary Kathryn Molumby, was an American film actress, possibly best known for her role as Virginia, the "spider baby" in the 1964 cult horror-comedy film "Spider Baby". She had a longhand complicated relationship with Marlon Brando.