Jell-O is an American brand offering a variety of powdered gelatin dessert (fruit-flavored gels/jellies), pudding, and no-bake cream pie mixes. The original gelatin dessert (genericized as jello) is the signature of the brand. "Jell-O" is a registered trademark of Kraft Heinz, and is based in Chicago, Illinois.

The dessert was especially popular in the first half of the 20th century, remaining popular in certain demographics. The original gelatin dessert began in Le Roy, New York, in 1897, when Pearle Bixby Wait trademarked the name Jell-O. He and his wife May had made the product by adding strawberry, raspberry, orange, and lemon flavoring to sugar and granulated gelatin (which had been patented in 1845). When water is added and the mixture is allowed to sit in the fridge for a few hours, it solidifies.