| Iisalmen Sahat (IPO Wood)SawmillIisalmen Sahat Oy | Finland | Softwood | Operating | 200 000 m3/y sawn timber |
| IKEA Industry Stalowa WolaSawmillIKEA Industry Poland Sp. z o.o. | Poland | Softwood | Operating | 200 000 m3/y sawn timberestimated from 400 000 m3/y log intake |
| IKEA Industry WielbarkSawmillIKEA Industry Poland Sp. z o.o. | Poland | Softwood | Operating | 125 000 m3/y sawn timberestimated from 250 000 m3/y log intake |
| Ilim Nordic Timber WismarSawmillIlim Nordic Timber GmbH & Co. KG | Germany | Softwood | Operating | 850 000 m3/y sawn timberestimated from 1 700 000 m3/y log intake |
| Ilim Timber Bavaria LandsbergSawmillIlim Timber Bavaria GmbH | Germany | Softwood | Operating | 425 000 m3/y sawn timberestimated from 850 000 m3/y log intake |
| Ilim Timber Bratsk (Bratsk Saw and Wood Processing Mill)SawmillIlim Timber, Bratsk branch | Russia | Softwood | Operating | No data yet |
| Ilim Timber Ust-Ilimsk (Ust-Ilimsk Timber Processing Plant)SawmillIlim Timber, Ust-Ilimsk branch | Russia | Softwood | Operating | 600 000 m3/y sawn timber |
| Imatra MillsPulp millStora Enso | Finland | Mixed | Operating | 1 300 000 t/y pulp |
| Imperatriz MillPulp millSuzano S.A. | Brazil | Hardwood | Operating | 1 650 000 t/y pulp |
| InduforestSawmillInduforest S.L. | Spain | Softwood | Operating | No data yet |
| InnTre Kjeldstad (Steinkjer)SawmillInnTre Kjeldstad AS | Norway | Softwood | Operating | No data yet |
| InnTre Kjeldstad LevangerSawmillInnTre Kjeldstad AS | Norway | Softwood | Operating | No data yet |
| InnTre Kjeldstad SelbuSawmillInnTre Kjeldstad AS | Norway | Softwood | Operating | No data yet |
| InnTre Kjeldstad StørenSawmillInnTre Kjeldstad AS | Norway | Softwood | Operating | No data yet |
| InnTre Kjeldstad VerdalSawmillInnTre Kjeldstad AS | Norway | Softwood | Operating | No data yet |
| Intercontinental Pulp MillPulp millCanfor Pulp | Canada | Softwood | Operating | 320 000 t/y pulp |
| Interfor Adams LakeSawmillInterfor Corporation | Canada | Softwood | Operating | 593 000 m3/y sawn timber |
| Interfor BaxleySawmillInterfor U.S. | United States | Softwood | Operating | No data yet |
| Interfor Bay SpringsSawmillInterfor U.S. | United States | Softwood | Operating | 238 000 m3/y sawn timber |
| Interfor CastlegarSawmillInterfor Corporation | Canada | Softwood | Operating | 390 000 m3/y sawn timber |
| Interfor DeQuincySawmillInterfor U.S. | United States | Softwood | Operating | 340 000 m3/y sawn timber |
| Interfor Ear FallsSawmillInterfor Corporation | Canada | Softwood | Idled 2025 | 280 000 m3/y sawn timber |
| Interfor EatontonSawmillInterfor U.S. | United States | Softwood | Operating | No data yet |
| 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 | 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 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 | Closed | 246 000 m3/y sawn timber |
| Interfor PerrySawmillInterfor U.S. | United States | Softwood | Operating | No data yet |
| Interfor PhilomathSawmillInterfor US | United States | Softwood | Converted | 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 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 | 246 000 m3/y sawn timber |
| 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 |
| Ishinomaki MillPulp millNippon Paper Industries Co., Ltd. | Japan | Softwood | Operating | 585 000 t/y pulp |
| Isojoen SahaSawmillIsojoen Saha Oy | Finland | Softwood | Operating | 150 000 m3/y sawn timber |
| ITC Paperboards Division BhadrachalamPulp millITC Limited | India | Hardwood | Operating | 350 000 t/y pulp |
| Iwakuni MillPulp millNippon Paper Industries Co., Ltd. | Japan | Softwood | Operating | 620 000 t/y pulp |
| 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 | Closed 2011 | No data yet |
| J.D. Irving DoaktownSawmillJ.D. Irving, Limited (Sawmills Division) | Canada | Softwood | Operating | No data yet |