List of Best in Show winners of the Westminster Kennel Club Dog Show

Best in Show of the Westminster Kennel Club Dog Show
Sussex Spaniel Clussexx Three D Grinchy Glee being presented with Best in Show in 2009
Country	United States
Presented by	Westminster Kennel Club
First awarded	1907
Currently held by	GCH Vjk-Myst Garbonita's California Journey (German Shorthaired Pointer)
Official website	Westminster Kennel Club

The title of "Best in Show" is given to the dog chosen as the winner of the Westminster Kennel Club Dog Show according to conformation show rules. It has its origins in the variety classes for champions that were introduced in 1905 which included prizes for best champion dog and best champion bitch. The title of Best in Show at Westminster has been awarded every year beginning in 1907 except for 1923 when changes in American Kennel Club rules prohibited mixed breed judging until a uniform process could be adopted; following further changes in rules it was awarded again in 1924.

The Westminster Kennel Club Dog Show is an all-breeds conformation show. It has been held in New York City, New York annually since 1877. It was held at Madison Square Garden for the first time in 1880, and is currently held in the modern arena of the same name. Dogs are first placed in breed specific classes for Best of Breed, with the winners moving on to the respective breed group. Winners from each group then compete for the title of Best in Show. In each class, the individual dogs are judged against the breed standard of each dog breed.

In 1992, competition at Westminster was restricted to champions only. A dog can only become a champion by gaining championship points at other conformation shows. Prior to 1992, admission to dogs was open, and in 1938 an English Setter named Daro of Maridor was the Best in Show title at Westminster in his very first outing at a dog show at the age of 11 months. In 1929, a previously unregistered British dog won at Westminster using the name Laund Loyalty of Bellhaven, aged nine months in his only show on American soil.

The James Mortimer Memorial Silver Trophy is awarded permanently should the dog win Best in Show on five separate occasions with the same owner, otherwise a silver-plated replica is awarded. As of 2010, the most successful dog to win Best in Show at Westminster was a Smooth Fox Terrier named Ch. Warren Remedy. She was the first winner of Best in Show and the only dog to have won it on three occasions.