| CRTT | Calibrated Radiance and Temperature Tape 
| Others |
| CRTT | Catonsville Rails
| Others |
| CRTT | Catonsville Rails to Trails
| Others |
| CRTT | Center for Research in Transportation Technologies
| Others |
| CRTT | Centre de recherche en terminologie et traduction
| Others |
| CRTT | Centre for Rail Training and Technology
| Others |
| CRTT | Centre for Research in Transportation Technologies
| Others |
| CRTT | Centre Radiologie Et Traitements Des Tumeurs
| Others |
| CRTT | Competitive Reaction Time Task
| Others |
| CRTT | Completely Random T Tessellation
| Others |
| CRTT | Computational Representational Theory of Thought
| Others |
| CRTT | Computerized Revised Token Test
| Others |
| CRTT | Croesor Rhosydd Through Trip
| Others |