TRD

TRD may refer to:

• Toyota Racing Development, the in-house tuning shop for Toyota-brand automobiles
• Treatment-resistant depression (or Treatment Refractory Depression), a type of depression used to describe individuals diagnosed with major depressive disorder and do not respond to traditional forms of treatment (namely, medication and psychotherapy)
• Tucson Roller Derby, the roller derby league located in Tucson, Arizona
• Trondheim Airport, Værnes (IATA Airport Code TRD)
• Thai Ridgeback Dog
• Transition radiation detector