DTR

DTR may refer to:

Medicine

 * Deep tendon reflex

Technology

 * Data Terminal Ready, a control signal in RS-232 serial communications
 * Desktop replacement computer, portable, with desktop-like capabilities
 * Digital Tape Recorder in spacecraft of the Voyager program

Others

 * The Deuteronomist historian (Dtr)
 * Dietetic Technician, Registered
 * Dorian Thompson-Robinson (born 1999), American football player
 * Downtown Radio, Northern Ireland