Lord John Roxton (a fictional title derived from the English parish of Roxton, Bedfordshire) is a supporting character in the Professor Challenger series of stories by Arthur Conan Doyle. He makes his initial appearance in the first entry of this series, The Lost World (1912), wherein he is a member of the expedition to the titular land, and is a prominent character in some of the subsequent stories as well, specifically The Poison Belt and The Land of Mist.