XDR

XDR may refer to:
 * XDR (audio) or eXtended Dynamic Range, a quality-control system for pre-recorded audio cassettes
 * XDR (video game), for the Sega Mega Drive
 * XDR DRAM, a type of computer memory
 * XDR Schema, a discontinued schema language for XML documents
 * External Data Representation, a data interoperability format
 * Extensively drug-resistant, a category of multiple drug resistance
 * Special drawing rights, a monetary unit of the International Monetary Fund (ISO 4217 currency code XDR)
 * Extended detection and response, a cyber security technology that monitors and mitigates cyber security threats