The Smooth Fox Terrier is a breed of dog, one of many terrier breeds. It was the first breed in the fox terrier family to be given official recognition (by The Kennel Club [London] circa 1875; breed standard 1876). It is well known, and although not a widely popular breed today outside of hunting and show circles, it is extremely significant due to the large number of terriers believed descended from it.

The Smooth Fox Terrier is a balanced, well-proportioned terrier with a distinctive head that has a tapering muzzle, fiery dark eyes, and folded v-shaped ears. It is a strong dog in that it is well-muscled and exhibits endurance, but should not appear in any way coarse or cloddy. Its coat must be predominantly white with markings in any other color except brindle, red, or liver.

The Smooth Fox Terrier was developed in England and is believed to descend from a mixture of the smooth-coated Black and Tan Terrier, the Greyhound, the Bull Terrier, and the Beagle.

Smooth Fox Terriers that are to be kept as family pets must be kept active, exercised, and interested, otherwise their hunting instincts will come out. These result in undesirable behavior including chasing of small animals, barking, and digging. Like most terriers, Smooth Fox Terriers become bored, destructive, or escape artists if ignored.