RIA
- Astro Ria
- R1A (disambiguation)
- RIA (restaurant)
- RIA Novosti
- Radioimmunoassay
- Railway Industry Association
- Rare Isotope Accelerator
- RateItAll
- Rea (disambiguation)
- Registered investment advisor
- Regulatory impact analysis
- Research into Ageing
- Rhea (disambiguation)
- Rhoose Cardiff International Airport railway station
- Ria (given name)
- Ria (singer)
- Ria 89.7FM
- Ria Money Transfer
- Rich Internet Application
- Rio (disambiguation)
- Riya
- Robotic Industries Association
- Rock Island Armory
- Rock Island Arsenal
- Royal Irish Academy
- Royal Irish Artillery
- Royal Italian Army
- Ríos (disambiguation)
- Santa Maria Airport (Rio Grande do Sul)
- Thomson Reuters