| CLAC | Clinical Laboratory Association of California | 加州临床实验室协会 |
| CLAC | Christian Labour Association of Canada | 加拿大基督教劳工协会 |
| CLAC | chloracetyl | 氯乙酰 |
| CLAC | Civil Liberties Action Committee (Guyana) | 公民自由行动委员会（圭亚那） |
| CLAC | ClickAction, Inc. | ClickAction公司。 |
| CLAC | Central Laboratory for Agricultural Climate | 农业气候中心实验室 |
| CLAC | ComunitÀ per le Libere AttivitÀ Culturali | ComunitÀ per le Libere AttivitÀ Culturali |
| CLAC | Light Attack Craft Carrier (Honor Harrington science fiction novels) | 轻型攻击航母（荣誉哈灵顿科幻小说） |
| CLAC | Convergence des Luttes Anti-Capitalistes (Canada) | 卢特斯反资本主义联盟（加拿大） |
| CLAC | Canal Lands Advisory Committee | 运河土地咨询委员会 |