| CASTLE | Capacitor Aided System For Teaching And Learning Electricity 
| Others |
| CASTLE | Centre for Advanced Studies Technical Link Event
| Others |
| CASTLE | Charlotte Area STEM Teaching and Learning Environment
| Others |
| CASTLE | Commitment Allegiance Support Teamwork Leadership and Enthusiasm
| Others |
| CASTLE | Computer Aided Systems for Teacher Led Education
| Others |
| CASTLE | Computer Assisted System for Theater Level Engineering
| Others |
| CASTLE | Controls Analysis and Simulation Test Loop Environment
| Others |