VSO

VSO may refer to:
 * VSO, an aircraft's stall speed in the landing configuration
 * Valdosta Southern Railroad
 * Vancouver Symphony Orchestra, a Canadian orchestra performing in Vancouver, British Columbia
 * Variable Speed Oscillator - see Oscillation
 * Verb–subject–object in Linguistic typology
 * Vermont Symphony Orchestra, a symphony orchestra based in, and supported in part by, the U.S. state of Vermont
 * Victoria State Opera, Australian opera company, merged in 1996 with Opera Australia
 * Vienna State Opera, an opera house – and opera company – with a history dating back to the mid-19th century
 * Vienna Symphony Orchestra
 * Violin Shaped Object, a pejorative term for a low-quality violin
 * Visual Studio Online, an early name for Azure DevOps (previously Visual Studio Team Services), a hosted application lifecycle management service from Microsoft
 * Voluntary Service Overseas, an international development charity
 * Volvo Super Olympian, double-decker bus