QSO may refer to:
*Quasi-stellar object or
quasar
*
Queen's Service Order
The Queen's Service Order, established by royal warrant of Queen Elizabeth II on 13 March 1975, is used to recognise "valuable voluntary service to the community or meritorious and faithful services to the Crown or similar services within the pu ...
, New Zealand honour
*
Queensland Symphony Orchestra
Queensland Symphony Orchestra (QSO) is an Australian symphony orchestra in the state of Queensland. The orchestra is based in the Australian Broadcasting Corporation's building in South Bank. The Orchestra is funded by private corporations, t ...
*
The Quantic Soul Orchestra
William Holland (born 1980) is an English musician, DJ and record producer. He is based in New York City, after spending seven years in Colombia. Holland records under various pseudonyms, including Quantic, the Quantic Soul Orchestra, The L ...
*
QSO, a Q code used in commercial and amateur radio communication
*The IATA airport code for
Sousse, Tunisia
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