A kennel club is an organization for canine affairs that concerns itself with the breeding, showing and promotion of more than one breed of dog. All-encompassing kennel clubs are also referred to as 'all-breed clubs', although "all" means only those breeds that they have decided to recognize, and "breed" means purebred dogs, not including dog hybrids and crossbreeds or mixed-breed dogs. A club that handles only one breed is known as a breed club.

The Kennel Club ("KC") in the United Kingdom is a kennel club based in London. It is the oldest of the world’s all-breed kennel clubs and one of the most prestigious. It is also the largest in the United Kingdom. It was the first official registry of purebred dogs in the world, and its annual registrations in the early 2000s average 280,000. The club was founded on the 4 April 1873.

The Club’s signature event is the prestigious and world-famous Crufts dog conformation show, held annually since 1948, which attracts competitors from all over the world. It also holds the much-smaller Scruffts for nonpurebred dogs and the exhibition Discover Dogs.

The Kennel Club's primary objective is "to promote in every way the general improvement of dogs". It is able to offer dog owners an unparalleled source of information, experience and advice on dog welfare, health, training and breeding.