John Campbell Allen
 Sir John Campbell Allen (October 1 1817 – September 27 1898) was from 1865–1896 a justice of the colonial and then provincial Supreme Court of New Brunswick serving as Chief Justice of New Brunswick from 1875 to 1896. He was born in Kingsclear Parish New Brunswick a grandson of Isaac Allen a New Brunswick Supreme Court judge. He studied law in the office of John Simcoe Saunders.