| Acronym | Definition |
|---|
| RTD | returned to duty (US DoD) |
| RTD | Regional Transportation District |
| RTD | Ready to Drink |
| RTD | Richmond Times-Dispatch |
| RTD | Rated |
| RTD | Resistance Temperature Detector |
| RTD | Retired (sports) |
| RTD | Russell T Davies (TV writer) |
| RTD | Real-Time Data |
| RTD | Research, Technological Development |
| RTD | Research and Technology Development |
| RTD | Rapid Transit District |
| RTD | Radioactive Threat Detection |
| RTD | Residence Time Distribution |
| RTD | Return to Duty |
| RTD | Resistance Temperature Device |
| RTD | Round-Trip Delay |
| RTD | Road Transport Department |
| RTD | Real-Time Display |
| RTD | Ready to Die (gaming clan) |
| RTD | Resonant-Tunneling Diode |
| RTD | Right to Development |
| RTD | Record Type Definition |
| RTD | Round Table Deutschland |
| RTD | Rapid Test Designer |
| RTD | Real Time Dispatch |
| RTD | Refugee Travel Document |
| RTD | Rail Transportation Division (American Society of Mechanical Engineers) |
| RTD | Radiodiffusion Télévision de Djibouti |
| RTD | Reconfigurable Tactile Display |
| RTD | Rio Tinto Diamonds |
| RTD | Resistive Thermal Device |
| RTD | Recherches Techniques Dentaires (French: Dental Research Techniques; est. 1968) |
| RTD | Renal Tubular Dysgenesis (aka Primitive Renal Tubule Syndrome) |
| RTD | Research and Technology Division |
| RTD | Rule the Day |
| RTD | Rome Transit Department |
| RTD | Rice Tungro Disease |
| RTD | Reproductive Toxicology Division |
| RTD | Research and Technology Directorate (NASA) |
| RTD | Röntgen Technischer Dienst GmbH (German) |
| RTD | Reutilization/Transfer/Donation |
| RTD | Resistance Thermal Detector |
| RTD | Radiation and Technology Demonstration (NASA mission) |
| RTD | Registered Time-to-Degree (National Research Council) |
| RTD | Real-Time Defrag |
| RTD | Rappelle Toi Demain (French: Remember You Tomorrow; band) |
| RTD | Resistant Temperature Device |
| RTD | Rotation Tour Date (USMC) |
| RTD | Roll to Dodge (gaming) |
| RTD | Return To Dominance |
| RTD | Russell's Theory of Descriptions |
| RTD | Real Time Driver |
| RTD | Radio-Technology-Dependent |
| RTD | Real Time Distributor |
| RTD | Resident Training Detachment |
| RTD | Residual Thermal Damage |
| RTD | Requirement to Discontinue |
| RTD | Rule the Dark |
| RTD | Recent Trends in Dynamics |
| RTD | Roll the Die |
| RTD | Return to Desktop |
| RTD | Rubber Tired Dozer |
| RTD | Recruit Training Depot |
| RTD | Receiver-Transmitter Device |
| RTD | Real Tape Drive |
| RTD | Referee Technical Decision (boxing) |
| RTD | Remote Terminal, Display |
| RTD | Replacement Training Division |
| RTD | Resubmission Turn-around Document |
| RTD | Reactor Technology Department (Savannah River Laboratory) |
| RTD | Rights in Technical Date |
| RTD | Robert the Doll (Florida ghost tour and museum piece) |