Whataburger is an American regional fast food restaurant chain, headquartered and based in San Antonio, Texas, that specializes in hamburgers. Founded by Harmon Dobson and Paul Burton, it opened its first restaurant in Corpus Christi, Texas in 1950. Family-owned by the Dobsons until 2019, the chain is now managed by the private equity firm BDT & MSD Partners; the Dobson family still holds a small stake.

A hamburger, also called a burger, is a food consisting of fillings—usually a patty of ground meat, typically beef—placed inside a sliced bun or bread roll. The patties are often served with cheese, lettuce, tomato, onion, pickles, bacon or chilis with condiments such as ketchup, mustard, mayonnaise, relish or a "special sauce", often a variation of Thousand Island dressing and are frequently placed on sesame seed buns. A hamburger patty topped with cheese is called a cheeseburger.