- DSSO stands for Duluth Superior Symphony Orchestra (Duluth, MN)
- DSSO stands for Den Stora Svenska Ordlistan (Swedish: The Great Swedish Dictionary)
- DSSO stands for Data System Support Organization (US DoD)
- DSSO stands for Disabled Student Services Office
- DSSO stands for Deaf Services of Southern Oregon (Medford, OR)
- DSSO stands for Defense Systems Support Organization
- DSSO stands for Defence Security Standards Organisation (UK)
- DSSO stands for Device Selection Scripting Object (Microsoft)
- DSSO stands for Dynamic Single Step Optimization
- DSSO stands for Defense Surplus Sales Office
- DSSO stands for Dealer Sponsored Servicing Owner
- DSSO stands for Doncaster Schools Senior Orchestra (UK)
- DSSO stands for double switched socket outlet
DSSO