The Inter Dominion is a harness racing competition that has been contested since 1936 in Australia and New Zealand. The Inter Dominion was the brain child of Western Australian Trotting Association Chairman Mr. J P Stratton, with the first series held at Gloucester Park, Perth. The host of the series is rotated between the six harness racing states of Australia and the North and South Islands of New Zealand. The rotation of the Championships is fixed annually at a meeting of the council. It is fixed five years in advance. It is held in New Zealand once in each four years.