| Acronym | Definition |
|---|
| CTRF | Canadian Transportation Research Forum |
| CTRF | Cancer Treatment Research Foundation (now Gateway for Cancer Research) |
| CTRF | Christian Theological Research Fellowship |
| CTRF | Connecticut Renaissance Festival (Woodstock, Connecticut) |
| CTRF | Census Tract Relationship Files (Inter-University Consortium for Political and Social Research) |
| CTRF | Celestial and Terrestrial Reference Frames |
