| Dinodesign AS | Hvittingfoss | 2023 |
| Dinus Media AS | Froland | 2013 |
| Dio Enterprise AS | Horten | 1986 |
| Dipl. Ing. Schindler & Wagner GmbH & Co. KG | De-73655 Plüderhausen | 2020 |
| Diplom-Is AS | Hagan | 2002 |
| Direct House Fredrikstad AS | Gressvik | 2022 |
| Director AS | Kristiansand S | 1984 |
| Direktehandel AS | Vigra | 2004 |
| Dirninger Rohrleitungsbau- Und Montage Gesellschaft M.B.H. | De-83395 Freilassing | 2017 |
| Discarded AS | Homborsund | 2019 |
| Discfinder AS | Drøbak | 2023 |
| Disruptive Value Group AS | Odda | 2018 |
| Ditrands AB Nuf | Se-595 58 Mantorp | 2026 |
| Diversen Søm & Design Ans | Flekkefjord | 1996 |
| Djews AS | Oslo | 2015 |
| Djupevåg Marine Norheimsund AS | Norheimsund | 2012 |
| Djurs Bådebyggeri | 8420 Knebel | 2014 |
| Djuvik Maskinering AS | Saudasjøen | 1993 |
| Djønne AS | Garnes | 2024 |
| Djønne Holding AS | Hylkje | 2018 |
| Djønne Modul AS | Hylkje | 1991 |
| DK Inox Norge AS | Mandal | 2025 |
| Dkfb AS | Florø | 2008 |
| DKM AS | Avaldsnes | 2017 |
| DLD Height Works Ltd | Aberdeen Ab10 1Xd Scotland | 2021 |
| DLH Service AS | Ålesund | 2015 |
| DM Energy AS | Fyresdal | 2018 |
| DM Filter AS | Skjold | 2010 |
| DM Prosjekter AS | Drøbak | 2014 |
| DM Renewables (Scotland) Limited | Glasgow G2 4Bg Scotland | 2024 |
| DM Service AS | Sogndal | 2022 |
| Dmbladerepair Ltd Nuf | Wc2H 9Jq London | 2025 |
| DMG Mori Norway AS | Barkåker | 2007 |
| DMG Mori Pfronten GmbH Nuf | De-87459 Pfronten | 2026 |
| Dmsalg AS | Fjellhamar | 2012 |
| Dna Co., Ltd. | Kr-17118 Gyeonggi-Do | 2023 |
| DNH A/S Den Norske Høyttalerfabrikk A/S | Kragerø | 1946 |
| Do IT Now AS | Drammen | 2020 |
| Doan Brodering AS | Kongsvinger | 2020 |
| Dockland AS | Oslo | 2008 |
| Dockside Motorservice AS | Vollen | 2026 |
| Dog Activities AS | Borkenes | 2013 |
| Dogsport Da | Skjeberg | 2010 |
| Dohmann GmbH | Asker | 2016 |
| Dokk Husøy AS | Avaldsnes | 2017 |
| Dokka Betong AS | Dokka | 2026 |
| Dokka Bondemøbler AS | Dokka | 2002 |
| Dokka Fasteners AS | Dokka | 1987 |
| Dokka Industries AS | Dokka | 2010 |
| Dokken Mekaniske Verksted AS | Bergen | 1993 |
| Dokken Sag AS | Flesberg | 2012 |
| Dolcevidda Iskremeri AS | Eidfjord | 2017 |
| Dolin AS | Kautokeino | 2017 |
| Dolmøy Båt AS | Skarnes | 2003 |
| Dolvik Båtbyggeri AS | Strusshamn | 1991 |
| Dombås Treimpregnering AS | Dombås | 1995 |
| Dometic Scandinavia AB Nuf | Se-42 131 Västra Frölunda | 2022 |
| Dominius AS | Oslo | 2016 |
| Dommersnes Mekaniske AS | Skjoldastraumen | 2023 |
| Domonas Nuf | Lt-96212 Samaliskes Vlg. Klaipeda | 2021 |
| Dompis Dominik Pawel Pisarski | Bekkjarvik | 2009 |
| Domstein AS | Måløy | 2018 |
| Domstein Service AS | Måløy | 2007 |
| Domstein Sjømat AS | Måløy | 2011 |
| Domstein Sjømat Produksjon AS | Måløy | 2014 |
| Donnas Smykkegalleri AS | Oslo | 2012 |
| Donsö Engine and Shiprepair AB Nuf | Se-421 31 Västra Frölunda | 2026 |
| Donut House Innlandet AS | Brandbu | 2021 |
| Donutbakeren AS | Bergen | 2022 |
| Donuts Huset AS | Lørenskog | 2022 |
| Doosan Lentjes GmbH | De-40880 Ratingen | 2018 |
| Doron D.O.O. | Hr-34000 Poega | 2011 |
| Dorssen Ims D.O.O. | Si-2281 Markovci Slovenia | 2018 |
| Dosp AS | Hokksund | 2025 |
| Dost Die Oberflächen Schutz Technik GmbH Nuf | De-58454 Witten | 2026 |
| Dot Duozink AS | Stokke | 2003 |
| Doublea AS | Fornebu | 2023 |
| Doudare AS | Sæbø | 2022 |
| Dough Holding AS | Oslo | 2025 |
| Dovre Group Canada | Nl A1C 6C9 Atlantic Place | 2010 |
| Doxa AS | Søgne | 2020 |
| Doxa Da | Vettre | 2010 |
| Doyle Holding AS | Ottestad | 2005 |
| DP Iot AS | Kjeller | 2019 |
| Dpcom AS | Oslo | 2001 |
| DR. Födisch Umweltmesstechnik AG | 04420 Markranstädt | 2018 |
| DR. Reddy's Denmark Aps Nuf | Dk-2665 Vallensbæk Strand | 2025 |
| Drag Gårdssag Da | Rørvik | 2023 |
| Drag Industrier AS | Bodø | 1983 |
| Drageboden AS | Kaupanger | 2022 |
| Drageslipen AS | Rognan | 2026 |
| Draghia Sveising AS | Bygstad | 2023 |
| Dragon Drinks AS | Sveio | 2022 |
| Dragon Yard AS | Haugesund | 1998 |
| Dragonfjord AS | Vanvikan | 2024 |
| Dragonforest Design Ans | Rubbestadneset | 2000 |
| Drake Chemicals AS | Voll | 2013 |
| Drammen Båtservice AS | Svelvik | 2006 |
| Drammen Emballasje AS | Drammen | 1992 |
| Drammen Industriservice AS | Drammen | 2019 |