| Acronym | Definition |
|---|
| CRTT➣Certified Respiratory Therapy Technician (now Certified Respiratory Therapist) |
| CRTT➣Croesor Rhosydd through Trip (mine exploration; UK) |
| CRTT➣Computational-Representational Theory of Thought (philosophy) |
| CRTT➣Chautauqua Rails-to-Trails (Mayville, NY) |
| CRTT➣Choice Reaction Time Test |
| CRTT➣Computer Resources Technology Transition |
| CRTT➣Chalk River Technicians and Technologists Independent Union (Canada) |