| Abbreviation | Definition |
|---|---|
| EPC | Economic Policy Council |
| EPIC | Eastern Pacific Investigation of Climate Processes |
| EPIC | Equatorial Pacific Interocean Circulation |
| EPOC | Eastern Pacific Oceanic Conference |
| EPOCS | Equatorial Pacific Ocean Climate Studies |
| EPOS | Earthquake Phenomena Observation System |
| EPR | East Pacific Rise |
| EPRI | Electric Power Research Institute |
| EQ | Earthquake |
| EQPAC | Equatorial Pacific |
| EQUALANT | Equatorial Atlantic Survey |
| EQUAPAC | Cooperative Survey of the Pacific Equatorial Zone |
| EQUARIDGE | International Study of the Equatorial Segment of the Mid- Atlantic Ridge |
| ER2 | Earth Resources-2 |
| ERBE | Earth Radiation Budget Experiment |
| ERBS | Earth Radiation Budget Satellite |
| ERDA | Energy Research and Development Administration |
| ERFEN | Regional Study of the El Nino Phenomenon |
| ERICA | Experiment on Rapidly Intensifying Cyclones over the Atlantic |
| ERIM | Environmental Research Institute of Michigan |