CSO
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The initialism CSO may mean:
- Central Statistics Office, Ireland
- Central Selling Organization, a De Beers marketing group based in London and seller of about 80% of the world's rough-cut diamonds
- chief strategy officer
- chief security officer
- colour-separation overlay
- combined sewer overflow
- Community Support Officer in the UK
- Chicago Symphony Orchestra
- Competitive Support Options
- Caltech Submillimeter Observatory on Mauna Kea, Hawaii