RIA

Ria or RIA may refer to:


 * Ria, a landform, often referred to as a drowned river valley
 * Ria (given name), a short form of Maria

Media

 * Astro Ria Malaysian pay-TV channel 104
 * Ria 89.7FM, a Singaporean radio station
 * RIA Novosti, Russian state news agency
 * RIA, formerly Research Institute of America, an American publisher on tax and regulatory matters owned by Thomson Reuters

Sciences

 * Radioimmunoassay
 * Rare Isotope Accelerator
 * Research into Ageing

Technology

 * RateItAll, a review website
 * Rich Internet Application
 * Robotic Industries Association
 * Rock Island Armory
 * IATA-Code of Santa Maria Airport

Others

 * Royal Italian Army, army of the Kingdom of Italy
 * Registered investment advisor, United States
 * Regulatory impact analysis
 * Rhoose Cardiff International Airport railway station, Wales
 * Ria (singer), New Zealand singer
 * RIA (restaurant), Chicago
 * Rock Island Arsenal, army base on the Mississippi River
 * Royal Irish Academy, an academic body
 * Ria Money Transfer, a remittances operator based in California
 * Railway Industry Association, a trade association in the United Kingdom