| Acronym | Definition |
|---|
| URSI➣Union Radio-Scientifique Internationale (French: International Union for Radio Science) |
| URSI➣Urban and Regional Studies Institute (various locations) |
| URSI➣Undergraduate Research Summer Institute |
| URSI➣United Recovery Systems, Inc. (Texas) |
| URSI➣International Union of Radio Science, IEEE (Institute of Electrical and Electronics Engineers) |