RRT or Rrt may refer to:

• Radio Reconnaissance Platoon
• Railroad Tycoon (series)
• Rainbow Round Table
• Rapidly exploring random tree
• Reference Rendering Transform (Academy Color Encoding System)
• Registered Respiratory Therapist
• Renal replacement therapy
• Randomized response technique
• Rational root theorem in mathematics
• Refugee Review Tribunal in Australia.
• Recommended Replacement Time (In Pacemaker and Internal Defibrillator, time to replace the device because of exhaustion of the batteries)
• Warroad International Memorial Airport (IATA code), airport in Warroad, Minnesota
• RRT Global, company specialising in technologies for oil refining
• Rapid Relief Team (RRT), global charity supporting emergency services and communities in need