| Southeastern Timber ProductsSawmillSoutheastern Timber Products LLC | United States | Softwood | Operating | No data yet |
| Spačva VinkovciSawmillBjelin Spačva d.o.o. (f.d. Spačva d.d.) | Croatia | Hardwood | Operating | No data yet |
| Spearfish Forest ProductsSawmillSpearfish Forest Products | United States | Softwood | Operating | 169 779 m3/y sawn timber |
| Spray Lake Sawmills (Cochrane)SawmillSpray Lake Sawmills Ltd. | Canada | - | Operating | No data yet |
| Springfield MillPulp millInternational Paper | United States | Softwood | Operating | 620 500 t/y pulp production |
| Spruce Products Ltd Swan RiverSawmillSpruce Products Ltd | Canada | Softwood | Operating | 93 379 m3/y sawn timber |
| Srbijašume pilana RaškaSawmillJP Srbijašume | Serbia | - | Operating | 30 000 m3/y |
| Stelmet Zielona GoraSawmillStelmet S.A. | Poland | - | Operating | 325 000 m3/y sawn timberestimated from 650 000 m3/y log intake |
| Stendal MillPulp millMercer International Inc. | Germany | Softwood | Operating | 740 000 t/y pulp production |
| Stenvalls Trä LövholmenSawmillStenvalls Trä AB | Sweden | Softwood | Operating | 150 000 m3/y sawn timber |
| Stenvalls Trä ÖrarnaSawmillStenvalls Trä AB | Sweden | Softwood | Operating | 65 000 m3/y sawn timber |
| Stenvalls Trä SeskaröSawmillStenvalls Trä AB | Sweden | - | Operating | No data yet |
| Stenvalls Trä SikforsSawmillStenvalls Trä AB | Sweden | Softwood | Operating | 170 000 m3/y sawn timber |
| Štětí MillPulp millMondi Group | Czech Republic | Mixed | Operating | 700 000 t/y pulp production |
| Stimson Forest GroveSawmillStimson Lumber | United States | Softwood | Operating | 169 779 m3/y sawn timber |
| Stimson PlummerSawmillStimson Lumber | United States | - | Closed | No data yet |
| Stimson Priest RiverSawmillStimson Lumber | United States | Softwood | Operating | 229 202 m3/y sawn timber |
| Stimson St. MariesSawmillStimson Lumber | United States | Softwood | Operating | 152 801 m3/y sawn timber |
| Stora Enso AlytusSawmillStora Enso Lietuva UAB | Lithuania | Softwood | Operating | No data yet |
| Stora Enso Bad St. LeonhardSawmillStora Enso Wood Products GmbH | Austria | - | Operating | 292 500 m3/y sawn timberestimated from 585 000 m3/y log intake |
| Stora Enso BrandSawmillStora Enso Wood Products GmbH | Austria | - | Operating | 300 000 m3/y sawn timberestimated from 600 000 m3/y log intake |
| Stora Enso HonkalahtiSawmillStora Enso Wood Products Oy Ltd | Finland | - | Operating | 330 000 m3/y sawn timber |
| Stora Enso ImavereSawmillStora Enso Eesti AS | Estonia | - | Operating | 350 000 m3/y sawn timber |
| Stora Enso LaunkalneSawmillStora Enso Latvija AS | Latvia | Softwood | Operating | 260 000 m3/y sawn timber |
| Stora Enso MurowSawmillStora Enso Wood Products Sp. z o.o. | Poland | Softwood | Operating | 260 000 m3/y sawn timberestimated from 520 000 m3/y log intake |
| Stora Enso NäpiSawmillStora Enso Eesti AS | Estonia | - | Closed 2023 | 50 000 m3/y sawn timber |
| Stora Enso PlanaSawmillStora Enso Wood Products Plana s.r.o. | Czech Republic | Softwood | Operating | 390 000 m3/y sawn timber |
| Stora Enso UimaharjuSawmillStora Enso Wood Products Oy Ltd | Finland | - | Operating | 240 000 m3/y sawn timber |
| Stora Enso VarkausSawmillStora Enso Wood Products Oy Ltd | Finland | Softwood | Operating | 260 000 m3/y sawn timber |
| Stora Enso YbbsSawmillStora Enso Wood Products GmbH | Austria | - | Operating | 450 000 m3/y sawn timberestimated from 900 000 m3/y log intake |
| Stora Enso ZdirecSawmillStora Enso Wood Products Zdirec s.r.o. | Czech Republic | - | Operating | 400 000 m3/y sawn timberestimated from 800 000 m3/y log intake |
| Stratton Lumber StrattonSawmillStratton Lumber | United States | Softwood | Operating | No data yet |
| Suifenhe China-Russia Timber Processing Trading Center (绥芬河中俄木材加工交易中心)SawmillVarious enterprises within park (kluster, ej ett enskilt bolag) | China | - | Operating | 1 000 000 m3/y sawn timberestimated from 2 000 000 m3/y log intake |
| Sun Mountain Lumber Deer LodgeSawmillSun Mountain Lumber | United States | Softwood | Operating | No data yet |
| Sun Mountain Lumber LivingstonSawmillSun Mountain Lumber | United States | - | Operating | No data yet |
| Sun Paper LaosPulp millShandong Sun Paper Group | Laos | Hardwood | Operating | 300 000 t/y pulp production |
| Sun Paper NanningPulp millShandong Sun Paper Group | China | Hardwood | Operating | 500 000 t/y pulp production |
| Sunila MillPulp millAALTO Development | Finland | Softwood | Closed 2023 | 375 000 t/y pulp production |
| Suzano MillPulp millSuzano S.A. | Brazil | Hardwood | Operating | 620 000 t/y pulp production |
| Svir sawmill (ex Metsa Svir)SawmillMetsa Svir LLC (renamed after sale) | Russia | - | Operating | 280 000 m3/y sawn timber |
| Swanson Group GlendaleSawmillSwanson Group | United States | - | Operating | No data yet |
| Sweden Timber HjortkvarnSawmillSweden Timber Hjortkvarn AB | Sweden | Softwood | Operating | No data yet |
| Sweden Timber MalmbäckSawmillSweden Timber AB | Sweden | Softwood | Operating | No data yet |
| Sweden Timber MoraSawmillSweden Timber Mora AB | Sweden | - | Operating | No data yet |
| Sweden Timber SkillingarydSawmillSweden Timber Skillingaryd AB | Sweden | - | Operating | No data yet |
| Świecie MillPulp millMondi Group | Poland | Softwood | Operating | 500 000 t/y pulp production |
| Swift LumberSawmillSwift Lumber, Inc. | United States | Softwood | Operating | No data yet |
| SWL KollerbeckSawmillSWL | Germany | Mixed | Operating | 37 500 m3/y sawn timberestimated from 75 000 m3/y log intake |
| Syassky MillPulp millSyassky | Russia | Softwood | Operating | 400 000 t/y pulp production |
| Sylva WieleSawmillSylva Sp. z o.o. | Poland | - | Operating | 150 000 m3/y sawn timberestimated from 300 000 m3/y log intake |