Theodore Arnold Haultain (1857?1941) was a British writer with a notably wide scope of work, including a romantic handbook dedicated to his daughter, a historical analysis of the 19th-century Canadian revolt, and even a reflection on the philosophy of walking tours. The son of a Major General in the British Army, Haultain was educated in London before moving to Canada, where he spent many years as secretary to the academic and historian Goldwin Smith. After Smith's death, Haultain wrote his memoir and served as his literary executor.