There are two registries in the United States for miniature horses: the American Miniature Horse Association (AMHA) and the American Miniature Horse Registry (AMHR). The AMHA was founded in 1978 and was dedicated to establishing the miniature horse as a distinct breed of horse. Many of the international organizations are associated with the AMHA, including clubs throughout Canada and in several European countries. The AMHR is a division of the American Shetland pony Club and was established as a separate registry in 1972.
Worldwide, there are dozens of miniature horse registries. Some organizations emphasize breeding of miniatures with horse characteristics, others encourage minis to retain pony characteristics. Along with registries for miniature horses in general, there are also breed-specific registries, such as several for the Falabella horse.