MDR

MDR may refer to:

Biology

 * MDR1, an ATP-dependent cellular efflux pump affording multiple drug resistance
 * Mammalian diving reflex
 * Medical device reporting
 * Multiple drug resistance, when a microorganism has become resistant to multiple drugs

Technology

 * Managed detection and response, a type of computer managed security service
 * Massive Data Repository, a data storage facility for the United States' Intelligence Community
 * Sony MDR-V6, a line of studio headphones designed by Sony
 * Medical device reprocessing
 * Memory data register, a hardware register where data to be transferred to/from memory are temporarily stored
 * Mental dead reckoning
 * Merchant discount rate, dues, fees, assessments, network charges and mark-ups that merchants are required to pay for accepting credit and debit cards
 * Metadata registry, a central location in an organization where metadata definitions are stored and maintained in a controlled method
 * Metadata repository, a database created to store metadata
 * Mini D ribbon, a cable connector type
 * Motion detection radar
 * Multifactor dimensionality reduction, an algorithm for detecting interactions
 * Desert Tech MDR, a bullpup rifle
 * MDR, programming language

Other

 * Moldavian Democratic Republic, a state existing between 1917 and 1918, predecessor of modern Moldova
 * mdr is the ISO 639 language code for the Mandar language
 * M. D. Ramanathan (1923–1984), Indian singer known as MDR
 * Mandatory declassification review, part of the process of removing the classification of a document
 * Medical Device Regulation (EU2017/745), a 2017 European Union regulation covering medical devices
 * Mitteldeutscher Rundfunk, German public broadcaster
 * Mort de rire, a French expression for "dead of laughing" (equivalent to English LOL)
 * Mouvement démocratique républicain (Republican Democratic Movement), former political party of Rwanda
 * Major district road in the state of Andhra Pradesh, India
 * Movement for Democracy and Reconstruction, political party in Liberia
 * Main Development Region, the area of the Atlantic Ocean in which the majority of its tropical cyclones form