MTTD

MTTD may refer to:
 * MT-TD, or mitochondrially encoded tRNA aspartic acid, a type of transfer RNA in human biology
 * Motor Transport and Traffic Directorate, an agency of the Ghana Police Service
 * Mean time to detection, a statistic in reliability engineering
 * Medium Tactical Truck Demonstrator, a variant in the U.S. Army Family of Medium Tactical Vehicles