| Maderas Goiriz (Vilalba)SawmillMaderas Goiriz SL | Spain | - | Operating | No data yet |
| Maderas Jaime Venturelli Planta LautaroSawmillMaderas Jaime Venturelli y Cia. Ltda. | Chile | - | Closed 2019 | No data yet |
| Maderas MartinSawmillMaderas Martin Ltda. | Chile | Softwood | Operating | No data yet |
| Maderas MasovaSawmillMaderas Masova S.L. | Spain | - | Operating | 12 000 m3/y sawn timber |
| Maderas Peña Lastra (Cantabria)SawmillJosé Peña Lastra S.A. (Maderas Peña Lastra) | Spain | - | Operating | No data yet |
| Maderas SieroSawmillMaderas Siero S.A. | Spain | - | Operating | No data yet |
| Maglaj MillPulp millNatron-Hayat d.o.o. | Bosnia and Herzegovina | Softwood | Operating | 120 000 t/y pulp production |
| Mahrt MillPulp millSmurfit Westrock | United States | Mixed | Operating | 710 000 t/y pulp production |
| Malå sågverkSawmillHS Timber Group (f.d. Setra) | Sweden | Softwood | Operating | 160 000 m3/y sawn timber |
| Mansfield MillPulp millInternational Paper | United States | Softwood | Operating | 650 000 t/y pulp production |
| Manzhouli Timber Processing Industrial Park (满洲里木材加工产业园)SawmillVarious enterprises within park (kluster, ej ett enskilt bolag) | China | - | Operating | No data yet |
| Maryvale MillPulp millOpal (Nippon Paper Industries subsidiary) | Australia | Softwood | Operating | 450 000 t/y pulp production |
| Masisa aserraderoSawmillMasisa S.A. | Chile | - | Operating | No data yet |
| Matane MillPulp millSappi Limited | Canada | Hardwood | Operating | 270 000 t/y pulp production |
| Materiaux Blanchet AmosSawmillMateriaux Blanchet Inc. | Canada | Softwood | Operating | 110 357 m3/y |
| Materiaux Blanchet Saint-PamphileSawmillMateriaux Blanchet Inc. | Canada | Softwood | Operating | No data yet |
| Mauricio Munoz y CiaSawmillMauricio Munoz y Cia. Ltda. | Chile | Softwood | Operating | No data yet |
| Maxau MillPulp millSchwarz Produktion (Schwarz Group) | Germany | Softwood | Operating | 400 000 t/y pulp production |
| Mayr-Melnhof Holz LeobenSawmillMayr-Melnhof Holz Leoben GmbH | Austria | Softwood | Operating | 500 000 m3/y sawn timberestimated from 1 000 000 m3/y log intake |
| Mayr-Melnhof Holz PaskovSawmillMayr-Melnhof Holz Paskov s.r.o. | Czech Republic | Softwood | Operating | 725 000 m3/y sawn timberestimated from 1 450 000 m3/y log intake |
| MCF Segheria (Magnifica Comunità di Fiemme - Azienda Segagione Legnami)SawmillMagnifica Comunità di Fiemme Azienda Segagione Legnami S.p.A. | Italy | Softwood | Operating | No data yet |
| McShan LumberSawmillMcShan Lumber Company | United States | Softwood | Operating | No data yet |
| MDR LegnamiSawmillMDR Legnami S.r.l. | Italy | Mixed | Operating | No data yet |
| Meadow Lake MillPulp millDomtar Corporation | Canada | Mixed | Operating | 450 000 t/y pulp production |
| Meiken Lamwood Kochi-sågverketSawmillMeiken Lamwood Corporation / Meiken Kogyo (銘建工業株式会社) | Japan | - | Operating | 50 000 m3/y sawn timberestimated from 100 000 m3/y log intake |
| Meiken Lamwood Kumamoto-sågverketSawmillMeiken Lamwood Corporation / Meiken Kogyo (銘建工業株式会社) | Japan | - | Operating | 50 000 m3/y sawn timberestimated from 100 000 m3/y log intake |
| Mendocino Forest Products UkiahSawmillMendocino Forest Products | United States | Softwood | Operating | No data yet |
| Menominee MillPulp millDomtar | United States | - | Operating | No data yet |
| Mercer Timber Products Friesau (Saalburg-Ebersdorf)SawmillMercer Timber Products GmbH | Germany | Softwood | Operating | 725 000 m3/y sawn timberestimated from 1 450 000 m3/y log intake |
| Mercer TorgauSawmillMercer Torgau GmbH & Co. KG | Germany | - | Operating | 550 000 m3/y sawn timberestimated from 1 100 000 m3/y log intake |
| Metsä Fibre LappeenrantaSawmillMetsä Fibre Oy | Finland | Softwood | Operating | 250 000 m3/y sawn timber |
| Metsä Fibre RaumaSawmillMetsä Fibre Oy | Finland | Softwood | Operating | 750 000 m3/y sawn timber |
| Metsä Fibre RenkoSawmillMetsä Fibre Oy | Finland | Softwood | Operating | 320 000 m3/y sawn timber |
| Metsä Fibre VilppulaSawmillMetsä Fibre Oy | Finland | Softwood | Operating | 535 000 m3/y sawn timber |
| Metsä MerikarviaSawmillMetsä Fibre Oy | Finland | - | Closed 2024 | 220 000 m3/y sawn timber |
| Milan LumberSawmillMilan Lumber Company | United States | Softwood | Operating | 118 846 m3/y sawn timber |
| Millar Western Fox CreekSawmillCanfor (f.d. Millar Western) | Canada | - | Operating | No data yet |
| Millar Western WhitecourtSawmillCanfor (f.d. Millar Western) | Canada | - | Operating | No data yet |
| Millari NZ (ex-Juken New Zealand) GisborneSawmillMillari NZ | New Zealand | - | Closed | 60 000 m3/y sawn timber |
| Misawa Homes of Finland MikkeliSawmillMisawa Homes of Finland Oy | Finland | Softwood | Operating | No data yet |
| Mission Forest Products CorinthSawmillMission Forest Products | United States | Softwood | Operating | 424 448 m3/y sawn timber |
| MM-Efimovsky sawmill (Efimovsky)SawmillOOO MM-Efimovsky | Russia | Softwood | Operating | 380 000 m3/y sawn timber |
| Moelven Årjäng SågSawmillMoelven Årjäng Såg AB | Sweden | Softwood | Operating | No data yet |
| Moelven Dalaträ (Mockfjärd)SawmillMoelven Dalaträ AB | Sweden | Softwood | Operating | No data yet |
| Moelven EdanesågenSawmillMoelven Edanesågen AB | Sweden | Softwood | Operating | No data yet |
| Moelven LøtenSawmillMoelven Løten AS | Norway | Softwood | Operating | 50 000 m3/y sawn timber |
| Moelven MjøsbruketSawmillMoelven Mjøsbruket AS | Norway | Softwood | Operating | No data yet |
| Moelven NotnäsSawmillMoelven Notnäs Ransby AB | Sweden | Softwood | Operating | No data yet |
| Moelven NumedalSawmillMoelven Numedal AS | Norway | Softwood | Operating | No data yet |
| Moelven ØsterdalsbruketSawmillMoelven Østerdalsbruket AS | Norway | Softwood | Operating | No data yet |