| Acronym | Definition |
|---|
| UDFA➣Undrafted Free Agent (National Football League) |
| UDFA➣Upper Demerara Football Association (Guyana) |
| UDFA➣Ultrasound Directed Follicle Aspiration |
| UDFA➣UMIST (University of Manchester Institute of Science and Technology) Database for Astrochemistry (UK) |