DTO may refer to: Data transfer object Detailed Test Objective, an experiment to be performed by NASA in space Download to own Deodorized tincture of opium Diluted tincture of opium Disruptive Technology Office Disney's Toontown Online Driverless train operation Drug trafficking organizations Domestic terrorist organization Denton Municipal Airport (IATA and FAA airport codes) "D.T.O.": a song on Vision of Disorder (album), the self-titled debut by the American metalcore band Denkmäler der Tonkunst in Österreich (Monuments of Fine Austrian Music), a book series Direct Tools Outlet, a retailer of new & factory reconditioned tools