What noble title does Elizabeth I Of England hold?

Elizabeth I Of England holds the noble title of Queen Regnant.
A queen regnant is a female monarch, equivalent in rank and title to a king, who reigns suo jure over a realm known as a "kingdom"; as opposed to a queen consort, who is the wife of a reigning king; or a queen regent, who is the guardian of a child monarch and rules pro tempore in the child's stead, be it de jure in sharing power or de facto in ruling alone.