Alphabetically Union List - F
- Fageeb Workers Union
- Fang Brothers Holding Workers Union
- Far East Garment Workers Union
- Far East Textile Workers Union
- Far East Workers Union
- Fashion Express Workers Union
- Faurecia Emissions Control Workers\' Union
- FCC Labour Union
- FCT Dolls Workers Union
- Fedura Top Workers Union
- Fedura Worker Union
- First Modern Workers Union
- First ST Workers Union
- Fish Marketimg State Enterprise Workers' Union
- Fishing Instruments Thaiald Workers Union
- FM Engineering Worker
- Foam and Chemical Industry Labour Union of Thailand
- Fok Yom Nambun Workers Union
- Fongson Printing Workers Union
- Food Institute Workers Union
- Food Pact Advance Workers Union
- Food Production Workers Union
- FORD & MAZDA Thailand Worker
- Ford Motor Thailand Workers\' Union
- Fore Most Thailand Workers Union
- Free Garment Udorn Thani Labour Union
- Freedom Group Worker's Union
- Freedom Principle Worker\'s Union
- Fresh Food Producer Workers Union
- Fujitrans Thailand Worker\'s Union
- Furniture and Workers Union Of Thailand
- Furniture Producer Workers Union
- Furukawa Metal (Thailand) Labour union
- Fusion Code Workers Union
- Futaba Workers Union
- Future Text Workers Union
