Campbell v Hall (1774) 1 Cowp 204, 98 ER 1045 was a case decided in the Court of King's Bench in 1774. On its face it was a private action for recovery of sums paid to a tax agent, but the decision laid down the principles of the King's constitutional authority in a British colony, deciding amongst other things that such authority is absolute until a representative assembly is granted, at which point the authority of the Crown is limited.