| R&T | Research and Technology 
| Others |
| R&T | Road and Track
| Others |
| R/T | Real Time
| Others |
| R/T | Receiver/Transmitter
| Others |
| RT | Race Team
| Others |
| RT | Race Train
| Others |
| RT | Racing Training
| Others |
| RT | Radiation Therapy
| Others |
| RT | Radio Tag
| Others |
| RT | Radio Telephone
| Others |
| RT | Radio Telephony
| Others |
| RT | Radio Telescope
| Others |
| RT | Radio Times
| Others |
| RT | Radio Trigger
| Others |
| RT | Radiologic Technologist
| Others |
| RT | RadioTherapy
| Others |
| RT | Rag Top
| Others |
| RT | Rail Transit
| Others |
| RT | Ralink Technology
| Others |
| RT | Random Team
| Others |
| RT | Random Thought
| Others |
| RT | Range-to-Target
| Others |
| RT | Rapid Transit
| Others |
| RT | Rational Thermosoling
| Others |
| RT | Raw Tape
| Others |
| RT | Raw Total
| Others |
| RT | Ray Traced
| Others |
| RT | Ray Tracing
| Others |
| RT | Re Tweet
| Others |
| RT | Re-Tweet
| Others |
| RT | Reaction Time
| Others |
| RT | Reactive Trigger
| Others |
| RT | Read and Trade
| Others |
| RT | Reader's Theatre
| Others |
| RT | Reagent Type
| Others |
| RT | Real Talk
| Others |
| RT | Realtime Trend
| Others |
| RT | Rebound Therapy
| Others |
| RT | Receiver Transmitter
| Others |
| RT | Receiver-Transmitter
| Others |
| RT | Reconditioning Test
| Others |
| RT | Record Type
| Others |
| RT | Recovery Team
| Others |
| RT | Recueillis Temporaires
| Others |
| RT | Recurrent tonsillitis
| Others |
| RT | Red Tailed
| Others |
| RT | Red Tape
| Others |
| RT | Red Toner
| Others |
| RT | Red Top
| Others |
| RT | Red Top Cab Company
| Others |
| RT | Reference Terminology
| Others |
| RT | Reference Time
| Others |
| RT | Reference Trajectory
| Others |
| RT | Reference Treatment
| Others |
| RT | Refrigeration Ton
| Others |
| RT | Refuse Transmission
| Others |
| RT | Regional Team
| Business |
| RT | RegionalTreffen
| Others |
| RT | Registered Technologist
| Others |
| RT | Regression Testing
| Others |
| RT | Regular Terms
| Others |
| RT | Regulation Tie
| Others |
| RT | Related Term
| Others |
| RT | Related To
| Others |
| RT | Related Topic
| Others |
| RT | Relative Timing
| Others |
| RT | Relator Term
| Others |
| RT | Reliable Totally
| Others |
| RT | Remote Terminal
| Others |
| RT | Render Time
| Others |
| RT | Repertory Theater
| Others |
| RT | Report Type
| Others |
| RT | Reproductive Technology
| Others |
| RT | Repulsor Transmitter
| Others |
| RT | Request Tracker
| Others |
| RT | Reset Type
| Others |
| RT | Residential Technician
| Others |
| RT | Resolved That
| Others |
| RT | Resource Teacher
| Others |
| RT | Respiratory Therapist
| Others |
| RT | Respiratory Therapy
| Others |
| RT | Respiratory Tract
| Others |
| RT | Response Time
| Others |
| RT | Restraint to Target
| Others |
| RT | ReTell
| Others |
| RT | Retention Time
| Others |
| RT | Retrieval Type
| Others |
| RT | Return This
| Others |
| RT | Return Type
| Others |
| RT | Retweet
| Others |
| RT | Reverberation Time
| Others |
| RT | Reverse Thrust
| Others |
| RT | Reverse Transcriptase
| Others |
| RT | Reviewed Title
| Others |
| RT | Revision Topic
| Others |
| RT | Revue de Transilvanie, Cluj-Sibiu
| Others |
| RT | Rhodes Tower (formerly University Tower, Cleveland State University)
| Others |
| RT | Rich Text
| Others |
| RT | Richard Thomas
| Others |
| RT | Richard Thompson
| Others |
| RT | Right takle
| Others |
| RT | Right Triangle
| Others |
| RT | Right Turn
| Others |
| RT | Ring Tone
| Others |
| RT | Ring Top
| Others |
| RT | RISC Technology
| Others |
| RT | River Terminal Railway Company
| Others |
| RT | River Terminals Railway
| Others |
| RT | Road Technician
| Others |
| RT | Road Tool
| Others |
| RT | Road Track
| Others |
| RT | Rob Tissera
| Others |
| RT | Robin Tolleson
| Others |
| RT | Robinson Technologies
| Others |
| RT | Roll Top
| Others |
| RT | Romantic Times
| Others |
| RT | Room Temperature
| Others |
| RT | Rooster Teeth
| Others |
| RT | Roosterteeth
| Others |
| RT | Root Tail
| Others |
| RT | Ross Technologies
| Others |
| RT | Rotten Tomatoes
| Others |
| RT | Rough Terrain
| Others |
| RT | Round Table
| Others |
| RT | Round Trip
| Others |
| RT | Routing and Transit number
| Others |
| RT | Royal Treatment
| Others |
| RT | RT Tours
| Others |
| RT | Ruby Tuesday
| Others |
| RT | Ruby Tuesday Inc.
| Others |
| RT | Rucni Top
| Others |
| RT | Rumtum Tugger
| Others |
| RT | Run Time
| Others |
| RT | Runtime Not to
| Others |
| RT | Russia Today
| Others |
| RT | Russian TV
| Others |
| RT | RV Trekking
| Others |