| CELT | California English Language Test 
| Others |
| CELT | California Extremely Large Telescope
| Others |
| CELT | Center for E-Learning and Teaching
| Others |
| CELT | Center for Educational Leadership and Technology
| Others |
| CELT | Center for Engaged Learning and Teaching
| Others |
| CELT | Center for Excellence in Learning and Teaching
| Others |
| CELT | Center for the Enhancement of Learning and Teaching
| Others |
| CELT | Central European Land Teracer
| Others |
| CELT | Centre for English Language Teaching
| Others |
| CELT | Centre for Enhancement of Learning and Teaching
| Others |
| CELT | Centre for Environmental Living and Training
| Others |
| CELT | Centre for Excellence in Learning and Teaching
| Others |
| CELT | Christian Education Leadership Training
| Others |
| CELT | Code Excited Lapped Transform
| Others |
| CELT | Connect Enable Learn Think
| Others |
| CELT | Constrained Energy Lapped Transform
| Others |