Alphabetically Union List - C
- c c p 2012 workers\'union
- Calby Thailand Workers Union
- Caltex Oil Workers Union
- Canadoil Thailand Workers union
- Cardinal Health Workers Union
- Career (Thailand) Workers Union
- Carina Thailand Workers Union
- Carnite Metal Box Monthly Workers Union
- Carten and Printing Workers Union
- Carten Box Labour Union
- Carten Products Workers Union of Thailand
- Casio Navanakhon Workers Union
- CCIC Product Inspection Workers Union
- CCM Samphan Supervisory Labour Union
- CEI Glass Workers Union
- CEI Workers Union
- Cellox Labour Union
- Cement Irregation Chaam Workers Union
- Cement Irregation Taklee Workers Union
- Central Food Labour Union
- Central Hotel Supervisory Labour Union of Thailand
- Central Hotel Workers Union
- Central Metal Workers Union of Thailand
- Central Paper Industry Workers Union
- Central Sports Workers Union
- Central Toys Workers Union
- Century Textile Workers Union
- Ceramics Samphan Workers Union
- CES Navanakhon Workers Union
- Chaimongkol Workers Union
- Chaiseree Mettal and Rubber Workers Union
- Chaiwiwat Workers Union
- Chakkal Labour Union
- Chakraval Chemee Worker
- Champion Workers Union
- Changjia Seramics Workers Union
- Chemical and Cosmetic Products Workers Union
- Chemical Rasin Industry Labour Union
- Cheupao Metal Middle Management Workers Union
- Chiangrai Land Workers Union
- Chiconi Samphan Workers Union
- Chihen Workers Union
- Chinano Kenchi (Thailand) Workers Union
- Chinawat Workers Union
- Chippomotis Thailand Workers Union
- Chiraichi Thailand Workers Union
- Chirs Tallace Workers Union
- Chopla Thailand Workers Union
- Chuntext Thailand Workers Union
- CIA Workers Union
- Civil Aronatic State Enterprise Workers' Union
- CK Workers Union of Thailand
- CKD Thailand Worker Union
- CKL Workers Union
- CKP Workers Union
- CL&A Supervisory Labour Union
- CL&A Workers Union
- CL&A Workers Union
- Club Made Workers Union
- CNI Workers Union
- Cobra For Life Workers Union
- Cobra International Workers Union
- Cobunshi Workers Union
- Collours and Chemicals Labour Union of Thailand
- Colour Lux Ruamjai Workers Union
- Combustible Material Transport Workers Union
- Combustible Materials Transport Labour Union
- Comofashion Workers Union
- Compass Samphan Workers Union
- Computer and Electronic Parts Workers Union
- Computer Parts Producers Labor Union
- Computer Parts Workers Union
- Concept Manufacturing Workers Union
- Consaft Manufacturing Workers Union
- Construction Enterprise Workers Union
- Construction Thailand Workers Union
- Construction Workers Union
- Construction Workers Union of Thailand
- Contemfrate Workers Union
- Conveyor Industrie Workers Union
- Cooking Oil Products Workers Union
- Cooking Oil Workers Union of Thailand
- Coop Foods Workers Union
- Corrugated Tin Executive Labour Union
- Corrugated Tin Products Workers Union
- Cosmo Consolidation Center Workers Union
- Cosmo Industrial Workers Union
- Cotgo Samphan Employees Union
- Country Products Workers Union of Thailand
- CP Sampan Labor Union
- CP Textile Nonthong Workers Union
- CPL Workers Union of Thailand
- Credit Agrigal Indosuez Bank Workers Union
- Crown Bebdan Workers Union
- Crown Nai Yang Workers Union
- Crown Text Weaving Workers Union
- Crytal Diamond Workers Union
