RTA

RTA may refer to:

Transit

• Regional Transportation Authority (Illinois), serving Chicago, United States
• Regional Transportation Authority (Tennessee), serving Nashville, United States
• Greater Cleveland Regional Transit Authority, Ohio, United States
• Greater Dayton Regional Transit Authority, Ohio, United States
• Roads and Transport Authority, serving Dubai, UAE
• Road Traffic Authority, a former authority in Victoria, Australia
• Roads and Traffic Authority in New South Wales, Australia
• Riverside Transit Agency in Riverside County, California, United States
• New Orleans Regional Transit Authority, United States
• Central Puget Sound Regional Transit Authority, United States
• South Florida Regional Transportation Authority, United States
• Regional Transit Authorities in the Mass Transit Division of the Massachusetts Department of Transportation
• Road Traffic Accident, a term for traffic collision.

Science and technology

• Real Time Analyzer for audio applications, such as analyzing sound
• Rapid thermal anneal - thermal process in semiconductor technology
• Road traffic accident, see Road traffic collision
• Restricted to Adults
• Retrospective Think Aloud
• Round-trip average, see Round-trip delay time

Medicine

• Renal tubular acidosis, the inability of the kidney to properly acidfy the urine
• Road Traffic Accident

Tenancy

• Residential Tenancies Authority, Queensland, Australia

Other

• Radio and Television Arts, the undergraduate broadcasting program at Ryerson University in Toronto
• Radio Television Afghanistan, the state-owned broadcasting corporation of Afghanistan
  • RTA TV, a main Afghan TV channel
• Regional trade agreement
• Rewriting Techniques and Applications, the main international academic conference on rewriting, currently held annually
• Right to Acquire, which enables Housing Association tenants to purchase their homes
• Rio Tinto Aluminium
• Royal Thai Army, the land branch of Thailand's armed forces
• Return-to-address