DTR or similar may refer to:
Medicine
- Deep tendon reflex, of muscles
- Dietetic Technician, Registered, a clinical role in the United States
Technology
- Data Terminal Ready, in RS-232 modem communication
- Desktop replacement computer, a large laptop
- Digital Tape Recorder, aboard NASA's Voyager spacecraft
Other uses
- Deuteronomist (Dtr), hypothesised Torah author(s)
- Dorian Thompson-Robinson (born 1999), American football player
- Downtown Radio, a Northern Ireland radio station