KSO may refer to:
Honours and titles Commander of the Order of the Sword (Swedish: ) Kommunstyrelseordförande, Swedish title for Municipal commissioner, equivalent to mayor Order of St. Olav, Norwegian honour
Orchestras Kalamazoo Symphony Orchestra, Michigan, United States Kaohsiung Symphony Orchestra, Taiwan Kensington Symphony Orchestra, London, England Kristiansand Symphony Orchestra, Norway
Radio stations
Call sign used from 1925 until 1935 by AM station KRNT, Des Moines, Iowa, United States Call sign used from 1935 until 1989 by AM station KXNO (AM), Des Moines, Iowa, United States
Other Kanzelhoehe Solar Observatory, Austria Aristoteles Airport, Kastoria, Greece Kingsoft Office, software suite A make of Vibram FiveFingers footwear Keep Sydney Open, or The Open Party in Australia