Rosemary Cornwallis is the wife of Cyril Cornwallis in the film Evil Bong.

Cyril introduces her to his Grandson Larnell and his room mates. They are shocked to see how old she considering he has the wealth to attract a far younger woman. Shortly after arriving at Larnell's apartment she collapses on their couch. Cyril claims this is due to sexual exaustion. She is evidentally a fierce racquetball player and a "vixen in the sack"

She is played by actress Mae Laborde less than three years before her one-hundreth birthday.