DSO may refer to:
Organisations Defence Science Organisation, now known as DSO National Laboratories, Singapore Defense Sciences Office, part of the US Defense Advanced Research Projects Agency Directorate of Special Operations, a South African law-enforcement agency Direct service organisation, a business unit of a United Kingdom local authority Groupe DSO, an Australian headquartered business cooperative
Orchestras Dallas Symphony Orchestra Denver Symphony Orchestra Detroit Symphony Orchestra Diablo Swing Orchestra Dubuque Symphony Orchestra, in Dubuque, Iowa Darwin Symphony Orchestra, in Darwin, Northern Territory, Australia Deutsches Symphonie-Orchester Berlin, in Berlin, Germany Dubrovnik Symphony Orchestra, in Dubrovnik, Croatia Dark Star Orchestra, in Chicago, Illinois, United States Dunedin Symphony Orchestra, New Zealand
Technology Digital sampling oscilloscope, samples measurements and displays or stores them Digital storage oscilloscope, which stores and analyses the signal digitally Direct sparse odometry, a machine vision algorithm for simultaneous localization and mapping Dynamic shared object, in computing Drakensang Online, the online computer game
Astronomy Dark Sky Observatory, Appalachian State University (ASU) facility Deep-sky object, in astronomy
Other uses Distinguished Service Order (disambiguation), several decorations Dark Star Orchestra, a Grateful Dead cover band formed in Chicago, Illinois Diablo Swing Orchestra, a Swedish avant-garde metal band Digital switchover Dental service organizations Days sales outstanding, in accountancy and finance Direct shipping ore, iron ore that can be shipped directly to a steel furnace Distribution system operators, in energy systems Diving safety officer, an administrator of United States university's research diving safety program Defensive Systems Officer, a member of the flight crew responsible for defensive systems Dubai Silicon Oasis, a free-trade zone in Dubai Dobbertin Surface Orbiter, an amphibious vehicle Domestic security officer serving as riot police Sondok Airport, IATA airport code