| Interfor Elk LakeSawmillInterfor Corporation | Canada | Softwood | Operating | 255 000 m3/y sawn timber |
| Interfor FayetteSawmillInterfor U.S. | United States | Softwood | Operating | 272 000 m3/y sawn timber |
| Interfor GeorgetownSawmillInterfor U.S. | United States | Softwood | Operating | No data yet |
| Interfor GogamaSawmillInterfor Corporation | Canada | Softwood | Idled 2026 | 187 000 m3/y sawn timber |
| Interfor Grand ForksSawmillInterfor Corporation | Canada | Softwood | Operating | 285 000 m3/y sawn timber |
| Interfor LongviewSawmillInterfor US | United States | Softwood | Operating | No data yet |
| Interfor MeldrimSawmillInterfor Corporation | United States | Softwood | Closed 2025 | No data yet |
| Interfor MolallaSawmillInterfor US | United States | Softwood | Operating | No data yet |
| Interfor MonticelloSawmillInterfor U.S. | United States | Softwood | Operating | No data yet |
| Interfor Nairn CentreSawmillInterfor Corporation | Canada | Softwood | Idled 2026 | 246 000 m3/y sawn timber |
| Interfor PerrySawmillInterfor U.S. | United States | Softwood | Operating | No data yet |
| Interfor PhilomathSawmillTimberlab | United States | Softwood | Converted 2024 | 374 000 m3/y sawn timber |
| Interfor Port AngelesSawmillInterfor US | United States | Softwood | Operating | No data yet |
| Interfor PrestonSawmillInterfor U.S. | United States | Softwood | Operating | No data yet |
| Interfor SummervilleSawmillInterfor Corporation | United States | Softwood | Closed 2025 | No data yet |
| Interfor SwainsboroSawmillInterfor U.S. | United States | Softwood | Operating | No data yet |
| Interfor ThomastonSawmillInterfor U.S. | United States | Softwood | Operating | No data yet |
| Interfor TimminsSawmillInterfor Corporation | Canada | Softwood | Operating | 272 000 m3/y sawn timber |
| Interfor Val-d'OrSawmillChantiers Chibougamau Ltée | Canada | Softwood | Closed 2025 | 246 000 m3/y sawn timber |
| Irénée Grondin & Fils (Saint-Zacharie)SawmillIrénée Grondin & Fils ltée | Canada | - | Operating | 80 000 m3/y sawn timberestimated from 159 000 m3/y log intake |
| Irving Forest Products Ashland (Nashville Plantation)SawmillIrving Forest Products | United States | Softwood | Operating | 221 000 m3/y sawn timber |
| Irving Forest Products DixfieldSawmillIrving Forest Products | United States | Softwood | Operating | 170 000 m3/y sawn timber |
| Irving MasardisSawmillIrving Forest Products | United States | Softwood | Operating | 195 000 m3/y sawn timber |
| Isojoen SahaSawmillIsojoen Saha Oy | Finland | Softwood | Operating | 150 000 m3/y sawn timber |
| J.D. Irving ChipmanSawmillJ.D. Irving, Limited (Sawmills Division) | Canada | Softwood | Operating | No data yet |
| J.D. Irving DeersdaleSawmillJ.D. Irving, Limited (Sawmills Division) | Canada | Softwood | Idled 2011 | No data yet |
| J.D. Irving DoaktownSawmillJ.D. Irving, Limited (Sawmills Division) | Canada | Softwood | Operating | No data yet |
| J.D. Irving KedgwickSawmillJ.D. Irving, Limited (Sawmills Division) | Canada | Softwood | Operating | No data yet |
| J.D. Irving St. LeonardSawmillJ.D. Irving, Limited (Sawmills Division) | Canada | Softwood | Operating | No data yet |
| J.D. Irving SussexSawmillJ.D. Irving, Limited (Sawmills Division) | Canada | Softwood | Operating | No data yet |
| J.H. Huscroft (Erickson/Creston)SawmillJ. H. Huscroft Ltd. | Canada | Softwood | Operating | 78 000 m3/y sawn timber |
| James Brown & SonSawmillJames Brown & Son | United Kingdom | - | Operating | No data yet |
| James Jones & Sons AboyneSawmillJames Jones & Sons Ltd | United Kingdom | - | Operating | No data yet |
| James Jones & Sons Annan (ex Kerr Timber Products)SawmillJames Jones and Sons Limited | United Kingdom | Softwood | Operating | No data yet |
| James Jones & Sons KirriemuirSawmillJames Jones and Sons Limited | United Kingdom | - | Operating | No data yet |
| James Jones & Sons LockerbieSawmillJames Jones & Sons Ltd | United Kingdom | Softwood | Operating | 240 000 m3/y sawn timber |
| James Jones & Sons MosstodlochSawmillJames Jones and Sons Limited | United Kingdom | Softwood | Operating | No data yet |
| Jasper LumberSawmillJasper Forest Products | United States | Softwood | Operating | 221 000 m3/y sawn timber |
| Javorice PteniSawmillJavorice a.s. | Czech Republic | Softwood | Operating | 172 000 m3/y sawn timberestimated from 343 000 m3/y log intake |
| JDI TruroSawmillJ.D. Irving, Limited | Canada | Softwood | Operating | 120 000 m3/y sawn timber |
| Jet-PuuSawmillJet-Puu Oy | Finland | Softwood | Operating | 40 000 m3/y sawn timber |
| JGA LinnerydSawmillJ.G. Anderssons Söner AB (JGA) | Sweden | Softwood | Operating | 250 000 m3/y sawn timber |
| Johann Kirchhoff (Joki) FinnentropSawmillJohann Kirchhoff GmbH & Co. KG (Joki) | Germany | Softwood | Operating | 80 000 m3/y sawn timberestimated from 160 000 m3/y log intake |
| Johann Offner Holzindustrie WolfsbergSawmillJohann Offner Holzindustrie GmbH | Austria | Softwood | Operating | 350 000 m3/y sawn timberestimated from 700 000 m3/y log intake |
| Johann Pabst Holzindustrie ObdachSawmillJohann Pabst Holzindustrie GmbH | Austria | Softwood | Operating | 210 000 m3/y sawn timberestimated from 420 000 m3/y log intake |
| John Gordon & Son (Gordon Timber)SawmillJohn Gordon & Son Ltd | United Kingdom | Softwood | Operating | No data yet |
| Jordan Lumber Mt. GileadSawmillJordan Lumber & Supply | United States | Softwood | Operating | No data yet |
| Josef Baust Holzbetrieb EsloheSawmillJosef Baust Holzbetrieb | Germany | Softwood | Operating | 25 000 m3/y sawn timberestimated from 50 000 m3/y log intake |
| Josef Ziegler Ploessberg-SteinSawmillJosef Ziegler GmbH | Germany | Softwood | Operating | 125 000 m3/y sawn timberestimated from 250 000 m3/y log intake |
| JPJ-WoodSawmillJPJ-Wood Oy | Finland | Softwood | Operating | 200 000 m3/y sawn timber |