Ro or RO may refer to:
Businesses and organizations Ro (company), an American telehealth company Royal Ordnance, a British armaments manufacturer TAROM, a Romanian airline, IATA airline code RO
Places Rø, Denmark Ro, Emilia-Romagna, Italy Ro, Greece, a small Greek island Romania (ISO 3166-1 country code RO)
Science and technology .ro, Internet country code top-level domain for Romania Ro (antigen) Autoantigen Ro, a protein Ro (volume), an Egyptian unit of measurement Radio occultation, a technique for measuring the properties of an atmosphere Reactor operator, a person who controls a nuclear reactor Reverse osmosis, a water purification process Receive only, a type of teleprinter Anti-SSA/Ro autoantibodies (anti–Sjögren's-syndrome-related antigen A autoantibodies)
Other uses Ro (kana), a Japanese character Ro (name), a given name, nickname and surname Ro (dubious Danish king) Ro (pharaoh) or Iry-Hor (fl. c. 3170 BC), Egyptian pharaoh Ro (title), a Fijian title of nobility Ro (video game), 2008 Ro language, a constructed language Rö Church, in Stockholm County, Sweden Lancia Ro, a 4x2 heavy truck built in the 1930s Romanian language, ISO 639-1 language code ro Range Officer, supervising a shooting range Renewables Obligation (United Kingdom), a British order requiring renewable electricity generation
See also R0 (disambiguation) Roe (disambiguation) Rho (disambiguation) ROH (disambiguation) Row (disambiguation) Rowe (disambiguation) Roro (disambiguation) Roll-on/roll-off, or RORO, cargo ships carrying wheeled cargo Assamese rô, a character distinctive to the Assamese alphabet