| Maderas Gámiz (Grupo Gámiz)SawmillMaderas Gámiz S.A. | Spain | Hardwood | Operating | 10 000 m3/y sawn timberestimated from 20 000 m3/y log intake |
| Maderas Goiriz (Vilalba)SawmillMaderas Goiriz SL | Spain | Softwood | Operating | No data yet |
| Maderas Jaime Venturelli Planta LautaroSawmillMaderas Jaime Venturelli y Cia. Ltda. | Chile | Softwood | Closed 2019 | No data yet |
| Maderas MartinSawmillMaderas Martin Ltda. | Chile | Softwood | Operating | No data yet |
| Maderas MasovaSawmillMaderas Masova S.L. | Spain | - | Closed | 12 000 m3/y sawn timber |
| Maderas Peña Lastra (Cantabria)SawmillJosé Peña Lastra S.A. (Maderas Peña Lastra) | Spain | Softwood | Operating | No data yet |
| Maderas SieroSawmillMaderas Siero S.A. | Spain | - | Operating | No data yet |
| Malå sågverkSawmillHS Timber Group | Sweden | Softwood | Operating | 160 000 m3/y sawn timber |
| 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 |
| Masisa aserraderoSawmillMasisa S.A. | Chile | Softwood | Operating | No data yet |
| Materiaux Blanchet AmosSawmillMateriaux Blanchet Inc. | Canada | Softwood | Operating | 255 000 m3/y sawn timber |
| Materiaux Blanchet Saint-PamphileSawmillMateriaux Blanchet Inc. | Canada | Softwood | Operating | 255 000 m3/y sawn timber |
| Mauricio Munoz y CiaSawmillMauricio Munoz y Cia. Ltda. | Chile | Softwood | Operating | No data yet |
| 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 |
| 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 | 212 000 m3/y sawn timber |
| 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 | Softwood | 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 | Softwood | Closed 2024 | 220 000 m3/y sawn timber |
| Milan LumberSawmillMilan Lumber Company | United States | Softwood | Operating | 119 000 m3/y sawn timber |
| Millari NZ GisborneSawmillMillari NZ | New Zealand | Softwood | Operating | 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 | 424 000 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 | 110 000 m3/y sawn timber |
| Moelven Dalaträ (Mockfjärd)SawmillMoelven Dalaträ AB | Sweden | Softwood | Operating | 110 000 m3/y sawn timber |
| Moelven EdanesågenSawmillMoelven Edanesågen AB | Sweden | Softwood | Operating | No data yet |
| Moelven LøtenSawmillMoelven Løten AS | Norway | Softwood | Closed 2025 | 50 000 m3/y sawn timber |
| Moelven MjøsbruketSawmillMoelven Mjøsbruket AS | Norway | Softwood | Operating | 110 000 m3/y sawn timber |
| Moelven NotnäsSawmillMoelven Notnäs Ransby AB | Sweden | Softwood | Operating | 225 000 m3/y sawn timber |
| Moelven NumedalSawmillMoelven Numedal AS | Norway | Softwood | Operating | 90 000 m3/y sawn timber |
| Moelven ØsterdalsbruketSawmillMoelven Østerdalsbruket AS | Norway | Softwood | Operating | 70 000 m3/y sawn timberestimated from 140 000 m3/y log intake |
| Moelven RansbySawmillMoelven Notnäs Ransby AB | Sweden | Softwood | Closed 2025 | 80 000 m3/y sawn timber |
| Moelven Soknabruket (Sokna)SawmillMoelven Soknabruket AS | Norway | Softwood | Operating | 220 000 m3/y sawn timber |
| Moelven TrysilSawmillMoelven Trysil AS | Norway | Softwood | Operating | No data yet |
| Moelven ValåsenSawmillMoelven Valåsen AB | Sweden | Softwood | Operating | 450 000 m3/y sawn timber |
| Moelven Våler (Braskereidfoss)SawmillMoelven Timber AS | Norway | Softwood | Operating | 195 000 m3/y sawn timber |
| Mokkan no Mori Yotsukura-fabriken (木環の杜 四倉工場)SawmillKowanomori Co., Ltd. (株式会社木環の杜) | Japan | Softwood | Operating | 55 000 m3/y sawn timberestimated from 110 000 m3/y log intake |
| Monnet-Sève Saint-VulbasSawmillMonnet Sève SA (MS Bois) | France | Softwood | Operating | 570 000 m3/y |
| Montrose Forest ProductsSawmillMontrose Forest Products | United States | Softwood | Operating | 144 000 m3/y sawn timber |
| Morgan LumberSawmillMorgan Lumber Company | United States | Softwood | Operating | No data yet |