Green Jellÿ is an American comedy rock band formed in 1981. Originally named Green Jellö, the band changed its name due to legal pressure from Kraft Foods Inc., the owners of the Jell-O brand, who claimed that it was an infringement of their trademark.

Jell-O, stylised as JELL-O, is an American brand offering a variety of powdered gelatin dessert, pudding, and no-bake cream pie mixes. The original gelatin dessert is the signature of the brand. "Jell-O" is a registered trademark of Kraft Heinz, and is based in Chicago, Illinois.