| Serradora Forestal de CatalunyaSawmillSerradora Forestal de Catalunya S.L.U. | Spain | - | Operating | No data yet |
| Serrerías GaroleraSawmillSerrerías Garolera S.L. | Spain | - | Operating | No data yet |
| Seshasayee Paper (SPB)Pulp millSeshasayee Paper and Boards Limited | India | Hardwood | Operating | 252 000 t/y pulp production |
| Setles sawmill (ex Stora Enso Impilahti)SawmillOOO Setles | Russia | - | Operating | No data yet |
| Setnovo sawmill (ex Stora Enso Nebolchi)SawmillOOO Setnovo | Russia | - | Operating | No data yet |
| Setra FärilaSawmillSetra Trävaror AB | Sweden | Softwood | Operating | 181 000 m3/y sawn timber |
| Setra HasselforsSawmillSetra Trävaror AB | Sweden | Softwood | Operating | 320 000 m3/y sawn timber |
| Setra HebySawmillSetra Trävaror AB | Sweden | Softwood | Operating | 276 000 m3/y sawn timber |
| Setra KastetSawmillSetra Trävaror AB | Sweden | Softwood | Operating | 270 000 m3/y sawn timber |
| Setra NybySawmillSetra Trävaror AB | Sweden | - | Operating | 197 000 m3/y sawn timber |
| Setra SkinnskattebergSawmillSetra Trävaror AB | Sweden | - | Operating | 136 000 m3/y sawn timber |
| SevLesPil SyktyvkarSawmillOOO SevLesPil | Russia | Softwood | Operating | 200 000 m3/y sawn timber |
| Sexton Lumber BloomfieldSawmillSexton Lumber Co Limited | Canada | Softwood | Operating | 135 823 m3/y sawn timber |
| Sguario Madeiras sågverkSawmillSguario Madeiras | Brazil | Softwood | Operating | No data yet |
| Shiraoi MillPulp millNippon Paper Industries Co., Ltd. | Japan | - | Operating | 365 000 t/y pulp production |
| Shouguang MillPulp millShandong Chenming Paper Holdings | China | - | Operating | 600 000 t/y pulp production |
| Shuqualak LumberSawmillShuqualak Lumber Company | United States | Softwood | Operating | No data yet |
| Siat Braun (Urmatt)SawmillSiat Braun | France | Softwood | Operating | 400 000 m3/y sawn timber |
| Sierra Forest Products Terra BellaSawmillSierra Forest Products | United States | Softwood | Operating | No data yet |
| Sierra Pacific (Seneca) EugeneSawmillSeneca Sawmill Company | United States | Softwood | Operating | No data yet |
| Sierra Pacific (Seneca) NotiSawmillSeneca Sawmill Company | United States | Softwood | Operating | No data yet |
| Sierra Pacific AberdeenSawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sierra Pacific AndersonSawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sierra Pacific BurlingtonSawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sierra Pacific BurneySawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| 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 OrovilleSawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sierra Pacific QuincySawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sierra Pacific Shasta LakeSawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sierra Pacific SheltonSawmillSierra Pacific Industries | United States | Softwood | Operating | No data yet |
| Sigurdson Forest Products (Williams Lake)SawmillSigurdson Forest Products Ltd. | Canada | Softwood | Operating | 122 241 m3/y sawn timber |
| Šilalės medienaSawmillUAB Šilalės mediena | Lithuania | Softwood | Operating | 200 000 m3/y sawn timber |
| Simpele MillPulp millMetsä Board Oyj | Finland | Mixed | Operating | 300 000 t/y pulp production |
| Singisi Forest Products (Merensky) - Kokstad/Harding/Langeni, 3 millsSawmillSingisi Forest Products | South Africa | Softwood | Operating | No data yet |
| Sirpur Paper MillsPulp millJK Paper Limited | India | Hardwood | Operating | 180 000 t/y pulp production |
| Skeena Sawmills (Terrace)SawmillROC Holdings Ltd. (Skeena Sawmills) | Canada | - | Closed 2023 | 168 081 m3/y sawn timber |
| Skoghall MillPulp millStora Enso | Sweden | Mixed | Operating | 370 000 t/y pulp production |
| Skookumchuck MillPulp millPaper Excellence | Canada | Softwood | Operating | 270 000 t/y pulp production |
| Skutskär MillPulp millStora Enso | Sweden | Mixed | Operating | 515 000 t/y pulp production |
| Slaatto Sag og HøvleriSawmillSlaatto Sag og Høvleri AS | Norway | Softwood | Operating | No data yet |
| Småland TimberSawmillSmåland Timber AB | Sweden | - | Operating | 30 000 m3/y sawn timber |
| Södra Wood KindaSawmillSödra Wood | Sweden | - | Operating | 240 000 m3/y sawn timber |
| Södra Wood LångasjöSawmillSödra Wood | Sweden | - | 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 | - | 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 | 489 000 m3/y sawn timber |
| Somerset MillPulp millSappi Limited | United States | Softwood | Operating | 525 000 t/y pulp production |