Acronyms
- Junior Reserve Officers' Training Corps, an American armed forces training program
- Radical Orthodoxy, an English Christian theology
- Radio occultation, a technique for measuring the properties of an atmosphere
- Reach Out (non-profit), an Australian information website
- Read-only access, a computer software attribute
- Read-only memory (ROM), a computer storage medium
- Receive only, a type of teleprinter
- Red Orchestra (espionage), a series of Soviet espionage rings
- Relaxation oscillator, an electronic oscillator
- Renewables Obligation, a British order requiring electricity generation from renewable sources
- Reserve Officers' Training Corps, an American armed forces training program
- Restraining order, a form of legal injunction
- Reverse osmosis, a filtration method
- Right only, a method of manipulating stereophonic sound
- RO (airline), a code for the Romanian airline TAROM
- RO (country), a country code for Romania
- ro (language code), a code for the Romanian language
- Royal Ordnance, a British armaments manufacturer
- Russian Orthodox, a Russian church
- Rough Opening, Framing (construction)
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