Membership of NASTA is open to any British-based breed society or stud-book association that runs a reputable stud-book. Organisations joining the Association undertake, as a condition of membership, that all their approved stallions will be veterinarily inspected according to the veterinary standards established and maintained by NASTA.

Affiliated bodies currently include:

The Arab Horse Society

The Trakehner Breeders' Fraternity

The Warmblood Breeders' Studbook - UK

The Welsh Pony and Cob Society

The National Pony Society (and all their affiliated pony breeds)

The Coloured Horse and Pony Society

The British Skewbald and Piebald Association

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