Alphabetically Union List - M
- M0LTEN ASIATHAILANDSUPERVISOR WORKERS’UNION
- Mahachack Workers Union of Thailand
- Mahasarakam Garment Workers Union
- Mahlay Siam Pilter System Workers Union
- Mail House Workers Union of Thailand
- Makunibest Workers Union
- Mali Condensed Milk Workers Union
- Manika Thai Workers Union
- Marcot Workers Union
- Marketing Organization for Farmers State Enterprise Workers
- Mass Rapid Transit Authority of Thailand Labour Union
- Master Skill Supply Workers Union
- Master Toys Workers Union
- Matalpha Thailand Workers Union
- Matsui Eastern Thailand Workers' Union
- Maxxis Thailand Worker's Union
- May Flower Labour Union
- Mayo Foods Workers Union of Thailand
- MC Agro Labour Union
- MCOT Labour Union
- Medcing and Medecal Supplies Labour Union
- Medical Equipment Labour Union of Thailand
- Mekhong Workers Union
- Melco Workers Union of Thailand
- Meoi Chen Labour Union
- Merillinch Beach Resort Phuket Workers Union
- Met Oxide Workers Union
- Metal Box Thailand Workers Union
- Metal Industry Labour Union of Thailand
- Metal Joint Makers Labour Union
- Metallic Workers Union of Thailand
- Metro Textile Trade Union
- Metropolitan Electricity Authority State Enterprise Employee's Association
- Metropolitan Waterworks Authority State Enterprise Employee's Association
- Mettechno Thailand Workers Union
- MHE Dmax Labour Union
- MICHELIN THAILAND WORKERS UNION
- Mick Electronic (Thailand) Workers Union
- Mikasa Thailand Workers Union
- Milott Workers Union
- Minson Enterprise Workers Union of Thailand
- Minson Luggage Thailand Workers Union
- Mintech Workers Union
- Misuki Electronics Workers Union
- Mitraphap Samphan Hadyai Workers Union
- Mitsamphan 2000 Workers Union
- Mitsamphan Auto Forging Thailand Workers Union
- Mitsubishi Electric Labour Union Thailand
- Mitsubishi Electric Supervisory Labour Union
- Mitsubishi Electric Thai Autopart Worker's Union
- Mitsubishi Workers Union of Thailand
- Mitsubishi Workers Union of Thailand
- Mitsui Siam Workers\' Union
- Mitsuva Toys Workers Union
- MKS Jwelry Labour Union
- MMC Electronics Labour Union
- Mobile Phone Songkhla Workers Union
- Mockcum Bangpain Workers Union
- Mollige Health Care Workers Union
- Molten Asia Polymer Product Workers Union
- Molten Asia Thailand Supervisor Worker\'s Union
- Mon Transport Workers Union
- Monmi Workers Union
- Morita Spring Workers Union
- Motocycle Parts Makers Labour Union
- Motocycle Workers Unio of Songkla
- MSI Machine Labour Union
- MSM Middle Management Workers Union
- MSM Thailand Workers Union
- MSP Sports Ware Labour Union
- MT Picture Display Labour Union of Thailand
- MTS Crane Labour Union
- Multi Thailand Workers Union
- Musachi Autoparts Workers Union
- Myer Aluminium Workers Union
