- Regional Trade Agreement
- Chicago 's Regional Transportation Authority
- Greater Cleveland Regional Transit Authority
- Road Traffic Accident, see Car Accident
- Roads And Traffic Authority , in New South Wales , Australia
- Renal Tubular Acidosis
- Riverside Transit Agency , in Riverside County, California
- Rewriting Techniques And Applications , the main international Conference on Rewriting , currently held annually.
- Rapid Type Analysis , see Static_analysis
- Real Time Analyser e.g. a microphone used to spectrally analyse sound.
- Rapid Thermal Annealing , a heat treatment method used in Materials Science and Microelectronics
- Radio Television Afghanistan , the state-owned broadcasting corporation of Afghanistan
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