DTO or dto may refer to:
Arts and entertainment Denkmäler der Tonkunst in Österreich, a series of Austrian sheet music (1894–2017) Disney's Toontown Online, an MMORPG video game (2003–2013) Download to own, in media distribution "D.T.O.", a song on the eponymous metalcore album Vision of Disorder
Science, technology and medicine Data transfer object, in computer programming Deodorized (or denarcotized) and diluted tinctures of opium, two drugs; see Download to own, in media distribution Driverless train operation, on railways
Other uses Disruptive Technology Office, a US military funding agency (1998–2007) Drug trafficking organizations, in US law enforcement Domestic terrorist organization, in US law enforcement Tommo So, spoken in Mali (ISO 636:dto) Denton Municipal Airport, Texas, US (by IATA and FAA code)