| LACS | Laboratory Animal Care Service 
| Others |
| LACS | Laboratory of Algorithmics, Cryptology, and Security
| Others |
| LACS | Lacunar Circulatory Syndrome
| Others |
| LACS | Language and Communication Skills
| Others |
| LACS | Laser Assisted Capsular Shrinkage
| Others |
| LACS | Latin American and Caribbean Section
| Others |
| LACS | Latin American and Caribbean Studies
| Others |
| LACS | League Against Cruel Sports
| Others |
| LACS | Leeds Attributional Coding System
| Others |
| LACS | Lehman Alternative Community School
| Others |
| LACS | Lexington Arts and Crafts Society
| Others |
| LACS | Liberal Arts Computer Science
| Others |
| LACS | Linear Algebra Communication Subroutines
| Others |
| LACS | Local Alarm and Control System
| Others |
| LACS | Locatable Address Change Service
| Others |
| LACS | Locatable Address Conversion System
| Others |
| LACS | Logical Access Control Systems
| Others |
| LACS | Los Altos Christian Schools
| Others |
| LACS | Los Angeles Chamber Singers & Cappella
| Others |
| LACS | Los Angeles Computer Society
| Others |
| LACS | Lowville Academy and Central School
| Others |
| LACS | Luxembourg American Cultural Society
| Others |