Commodore John Thomas Newton (May 20, 1793 – July 28, 1857) was an officer in the United States Navy who commanded several ships over a period of decades, undertaking missions in the Caribbean and leading the first crossing of the Atlantic by an American steam-powered warship. He was court-martialed following a fire that destroyed that vessel, but his suspension from service was remitted by President John Tyler, after which Newton commanded Pensacola Navy Yard and the Home Squadron for periods. He died while serving in his last post as president of a Naval Court of Inquiry.