| Rank | Abbreviation | Meaning |
|---|
| ***** | OASS | Overt Agitation Severity Scale
| |
| *** | OASS | Office of Admissions and Student Services
| |
| ** | OASS | One Army School System
| |
| ** | OASS | O-Acetyl-Serine Sulfhydrylase
| |
| * | OASS | Office of Academic Support Services
| |
| * | OASS | Of Asian Student Services
| |
| * | OASS | Optical Auto Switch System
| |
| * | OASS | Ohio Agricultural Statistics Service
| |
| * | OASS | Oregon Agricultural Statistical Service
| |
| * | OASS | Ontwerp en Analyse van Software Systemen
| |
| * | OASS | Single-particle Spin-pairing Amplitude method
| |
| * | OASS | O-acetylserine sulfhydrylase
| |
| * | OASS | Oklahoma Agricultural Statistics Service
| |
| * | OASS | obstructive apnea syndrome during sleep
| |
| * | OASS | Oregon Agricultural Statistics Service
| |
| * | OASS | Ocular Anaesthetic Scoring System
| |
| * | OASS | Office of Academic Student Services
| |
| * | OASS | O-acetyl-L-serine sulfhydrylase
| |