CRRT

The abbreviation CRRT may refer to


 * Cristopher Reuel Tolkien
 * Carrier Route mail sorting system for the United States Postal Service
 * Continuous renal replacement therapy
 * Chemical-Biological-Radiological Rapid Response Team
 * Commuter Rail Real Time data from the MBTA, providing train locations and arrival predictions for the MBTA Commuter Rail system
 * Cyber Rapid Response Team - EU countries (Lithuania, Estonia, Croatia, Poland, the Netherlands and Romania) cooperation in cyber area