| Sierra Pacific BurneySawmillSierra Pacific Industries | United States | Softwood | Operating | 441 000 m3/y sawn timber |
| Sierra Pacific CentraliaSawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sierra Pacific Chinese CampSawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sierra Pacific LincolnSawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sierra Pacific OrovilleSawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sierra Pacific QuincySawmillSierra Pacific Industries | United States | Softwood | Operating | 458 000 m3/y sawn timber |
| Sierra Pacific Shasta LakeSawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sierra Pacific SheltonSawmillSierra Pacific Industries | United States | Softwood | Operating | 849 000 m3/y sawn timber |
| Sierra Pacific SonoraSawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sigurdson Forest Products (Chilliwack)SawmillSigurdson Forest Products Ltd. | Canada | Softwood | Operating | 121 000 m3/y sawn timber |
| Sigurdson Forest Products (Williams Lake)SawmillSigurdson Forest Products Ltd. | Canada | Softwood | Operating | 122 000 m3/y sawn timber |
| Šilalės medienaSawmillUAB Šilalės mediena | Lithuania | Softwood | Operating | 200 000 m3/y sawn timber |
| Silvania International (Lunca Ilvei)SawmillSILVANIA INTERNATIONAL PROD SRL | Romania | Softwood | Operating | 125 000 m3/y sawn timberestimated from 250 000 m3/y log intake |
| Similkameen Forest Products (Princeton)SawmillGorman Group | Canada | Softwood | Operating | 509 000 m3/y sawn timber |
| Skeena Sawmills (Terrace)SawmillKitsumkalum First Nation | Canada | Softwood | Idled 2023 | 340 000 m3/y sawn timber |
| Småland TimberSawmillSmåland Timber AB | Sweden | Softwood | Operating | 30 000 m3/y sawn timber |
| Smiltene Impex (Launkalnes pag.)SawmillSIA Smiltene Impex | Latvia | - | Operating | 80 000 m3/y sawn timber |
| Södra Wood HaminaSawmillSödra Wood | Finland | - | Operating | No data yet |
| Södra Wood KindaSawmillSödra Wood | Sweden | Softwood | Operating | 240 000 m3/y sawn timber |
| Södra Wood LångasjöSawmillSödra Wood | Sweden | Softwood | Operating | 360 000 m3/y sawn timber |
| Södra Wood MönsteråsSawmillSödra Wood | Sweden | Softwood | Operating | 450 000 m3/y sawn timber |
| Södra Wood OrreforsSawmillSödra Wood | Sweden | Softwood | Operating | No data yet |
| Södra Wood UnneforsSawmillSödra Wood | Sweden | Softwood | Operating | 120 000 m3/y sawn timber |
| Södra Wood VäröSawmillSödra Wood | Sweden | Softwood | Operating | 610 000 m3/y sawn timber |
| Sokol Timber Company (Sokol DOK)SawmillSokol Timber Company | Russia | Softwood | Operating | 251 000 m3/y sawn timber |
| Solomensky lesozavod (Petrozavodsk)SawmillOOO "Aspek-Les" | Russia | Softwood | Operating | 210 000 m3/y sawn timber |
| Southeastern Timber ProductsSawmillSoutheastern Timber Products LLC | United States | Softwood | Operating | 221 000 m3/y sawn timber |
| Spačva VinkovciSawmillBjelin Spačva d.o.o. | Croatia | Hardwood | Operating | No data yet |
| Spearfish Forest ProductsSawmillSpearfish Forest Products | United States | Softwood | Operating | 170 000 m3/y sawn timber |
| Spray Lake Sawmills (Cochrane)SawmillSpray Lake Sawmills Ltd. | Canada | Softwood | Operating | 263 000 m3/y sawn timber |
| Spruce Products Ltd Swan RiverSawmillSpruce Products Ltd | Canada | Softwood | Operating | 93 000 m3/y sawn timber |
| Srbijašume pilana RaškaSawmillJP Srbijašume | Serbia | - | Operating | 30 000 m3/y |
| Stelmet Zielona GoraSawmillStelmet S.A. | Poland | Softwood | Operating | No data yet |
| 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 | Softwood | Idled | No data yet |
| Stenvalls Trä SikforsSawmillStenvalls Trä AB | Sweden | Softwood | Operating | 170 000 m3/y sawn timber |
| Stimson ClatskanieSawmillStimson Lumber Company | United States | - | Operating | No data yet |
| Stimson Forest GroveSawmillStimson Lumber | United States | Softwood | Operating | 170 000 m3/y sawn timber |
| Stimson PlummerSawmillStimson Lumber | United States | Softwood | Closed 2024 | 59 000 m3/y sawn timber |
| Stimson Priest RiverSawmillStimson Lumber | United States | Softwood | Operating | 229 000 m3/y sawn timber |
| Stimson St. MariesSawmillStimson Lumber | United States | Softwood | Operating | 153 000 m3/y sawn timber |
| Stimson TillamookSawmillStimson Lumber Company | United States | Softwood | Operating | No data yet |
| Stora Enso AlytusSawmillStora Enso Lietuva UAB | Lithuania | Softwood | Operating | 210 000 m3/y sawn timber |
| Stora Enso Bad St. LeonhardSawmillStora Enso Wood Products GmbH | Austria | Softwood | Operating | 293 000 m3/y sawn timberestimated from 585 000 m3/y log intake |
| Stora Enso BrandSawmillStora Enso Wood Products GmbH | Austria | Softwood | Operating | 300 000 m3/y sawn timberestimated from 600 000 m3/y log intake |
| Stora Enso HonkalahtiSawmillStora Enso Wood Products Oy Ltd | Finland | Softwood | Operating | 330 000 m3/y sawn timber |
| Stora Enso ImavereSawmillStora Enso Eesti AS | Estonia | Softwood | 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 |