| Abbreviation | Definition |
|---|---|
| SMR | Supra Majority Rule |
| SMSgt | Senior Master Sergeant USAF |
| SMURF | Secret Military Underground Resistance Forces |
| SMURF | Socialist Men Under Red Father |
| SNA | System for Nuclear Auxiliary |
| SNAP | Significant New Alternatives Policy |
| SNAP | Streamlined Noncompeting Award Process |
| SNBI | Shall Not Be Infringed |
| SNC | Significant Non Compliance |
| SND | Second New Deal |
| SNIS | Sanitation National Information System |
| SNL | Sandia National Laboratories |
| SNL | Saturday Night Liberal |
| SNM | Somali National Movement |
| SNOMED | Systematized Nomenclature of Medicine |
| SNP | Still No Policies |
| SNS | Satisfactory Narrative Simulation |
| SNU | Sierra Nevada Unit |
| SNU | Substitution Of Nonconforming Use |
| SNZ | Santa Fe National Zone |