A corn dog (also spelled corndog) is a sausage (usually a wiener) on a stick that has been coated in a thick layer of cornmeal batter and deep fried. It originated in the United States and is commonly found in American cuisine.

A number of current corn dog vendors claim responsibility for the invention and/or popularization of the corn dog. Carl and Neil Fletcher lay such a claim, having introduced their "Corny Dogs" at the State Fair of Texas sometime between 1938 and 1942. "Pronto Pup" of Rockaway Beach, Oregon, claims to have invented the corn dog in 1939. "Cozy Dog Drive-in," in Springfield, Illinois, claims to have been the first to serve corn dogs on sticks, on June 16, 1946. Also in 1946, Dave Barham opened the first location of "Hot Dog on a Stick" at Muscle Beach in Santa Monica, California.

Corn dogs are often served as street food or as fast food. For the best and freshest preparation, some vendors or restaurateurs dip and fry their corn dogs just before serving. Some corn dog purveyors sell pre-made frozen corn dogs, which are then thawed and fried again, or browned in an oven.

Corn dogs can also be found at almost any supermarket and convenience store in North America as frozen foods as well as served hot and ready to eat. Pre-made frozen corn dogs can also be heated in a microwave oven, but the cornbread coating will lack texture.

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