| Rank | Abbreviation | Meaning |
|---|
| ***** | MCLS | Mucocutaneous Lymph Node Syndrome
| |
| **** | MCLS | Mining Company List of Sites
| |
| *** | MCLS | Mason County Library System (Point Pleasant, WV)
| |
| ** | MCLS | Moscow-Latah County Library System (Moscow, ID)
| |
| ** | MCLS | Magnetite cationic liposomes
| |
| ** | MCLS | Maximum credible loss scheme
| |
| * | MCLS | Maximum Contaminant Levels
| |
| * | MCLS | Maximum Contaminate Levels
| |
| * | MCLS | Massachusetts Correctional Legal Services, Inc.
| |
| * | MCLS | Metropolitan Cooperative Library System
| |
| * | MCLS | Management Consulting Listbroking Services
| |
| * | MCLS | Modern and Classical Language Studies
| |
| * | MCLS | Maximum Contamination Levels
| |
| * | MCLS | Madison County Library System (Canton, MS)
| |
| * | MCLS | Mobilization Cross-Leveling System
| |
| * | MCLS | Michigan Compiled Laws Service
| |
| * | MCLS | Mid Columbia Listing Service
| |
| * | MCLS | Madison Chinese Language School
| |
| * | MCLS | Monroe County Library System
| |
| * | MCLS | medial collateral ligaments
| |
| * | MCLS | Maximum Contaminant Level Standards
| |
| * | MCLS | Memphis Chinese Language School
| |
| * | MCLS | Malaria Commodities Logistics System
| |
| * | MCLS | McAfee Command Line Scanner
| |
| * | MCLS | Middlesex County Legal Services
| |