| Acronym | Meaning |
| EMAP | Environmental Monitoring And Assessment Program (US EPA) |
| EMAP | Energy-modified Adiabatic Phase (matrix Method) |
| EMAS | Eco-Management & Audit Scheme |
| EMAS | European Microbeam Analysis Society |
| EMAS | Electron Microprobe Auger Spectroscopy |
| EMAT | Effluent Microtox Acute Toxicity |
| EMAT | Electromagnetic-acoustic Transducers |
| EMBL | European Molecular Biology Laboratory |
| EMBO | European Molecular Biology Organization |
| EMBR | Electromagnetic Brakepar |
| EMCI | Envirofacts Master Chemical Integrator |
| EMCOR | European Minor Constituent Radiometer |
| EMD | Electrochemically (manufd.) Manganese Dioxide |
| EMDC | Elution-Modified Displacement Chromatography |
| EMEA | European Medicines Evaluation Agency |
| EMEFS | Eulerian Model Evaluation Field Study |
| EMEG | Environmental Media Evaluation Guides |
| EMEP | European Monitoring And Evaluation Program |
| EMER | Electromagnetic Molecular Electronic Resonance |
| EMF | Electromobility Focusing |
| EMF | Electromagnetic Force |
| EMF | Electromotive Force |
| EMG | Exponentially Modified Gaussian |
| EMI | Electromagnetic Interference |
| EMI | Enriched Mantle Component 1 (of S. R. Hart |
| EMIC | Environmental Mutagen Information Center Database (NLM) |
| EMIC | Electromagnetic Ion Cyclotron (waves) |
| EMII | Enriched Mantle Component 2 (of S. R. Hart |
| EMIRA | Epidemiological And Microbial Risk Assessment |
| EMIRS | Electrochemically Modulated Infrared Spectroscopy |
| EMIS | Environmental Management Information System |
| EMIT | Enzyme-multiplied Immunoassay Technique |
| EML | Environmental Mutational Load |
| EMLC | Electrochemically Modulated Liquid Chromatography |
| EMM | Electrochemical Micromachining |
| EMM | Electron Mirror Microscopy |
| EMMA | Electron Microscopy And Microanalysis |
| EMMA | Electrophoretically-mediated Microanalysis |
| EMMA | End-member Mixing Analysis |
| EMMA | Energy-dispersive Miniprobe Multielement Analyzer |
| EMMC | Environmental Monitoring Management Council |
| EMMI | Environmental Monitoring Methods Index |
| EMOA | Extended Maximum Overlap Approximation |
| EMP | Electron Micro-probe |
| EMP | Electrostatic Molecular Potential (for Electronic-structure) |
| EMP | Empirical Pseudopotential Method |
| EMPA | Electron Microprobe Analysis |
| EMPACT | Environmental Monitoring For Public Access And Community Tracking |
| EMPOSI | Electromagnetic Properties Of Sea Ice |
| EMPPL | Effluent Monitoring Priority Pollutants List |