| N Young Technical Services Ltd | Glasgow G75 9Ax Scotland | 2019 |
| Naas Kalksteinsbrudd AS | Eide | 2000 |
| Namdal Pukkverk AS | Verdal | 2000 |
| Namtvedt -Sealmaker Services AS | Paradis | 1986 |
| Nansen Spirit LLC Nuf | Stavanger | 2023 |
| Narvik Nikkel AS | Lakselv | 2022 |
| Natran | Fr-92270 Bois-Colombes | 2025 |
| Naturheller Og -Stein Nuf | Arendal | 2007 |
| Naturlig Landro AS | Voss | 2015 |
| Natursteinpartner AS | Vikebukt | 2010 |
| Naturstenskompaniet Norge AS | Skjeberg | 2001 |
| Navitas International Solutions Ltd | Peterhead Ab42 3Aw | 2016 |
| NCB Subsea Limited | Aberdeen Ab15 7Sd Scotland | 2017 |
| NCS Multistage Norge | Oslo | 2018 |
| NDT Global AS | Øvre Ervik | 2011 |
| NDT ST Ives Ltd | Cambridgeshire Pe284Lf | 2014 |
| NDW Offshore Services Limited | Suffolk Ip13 9Eu | 2012 |
| Neil Offshore Services Ltd | Fort William Ph33 7Pe | 2025 |
| Nellemann Survey | Dk-9000 Aalborg | 2015 |
| Neptune Rov Services Ltd | Aberdeen Ab10 1Ha Scotland | 1995 |
| Nesbyen Pukk & Betong AS | Nesbyen | 1988 |
| Nesfjellet Massegjenvinning AS | Nesbyen | 2026 |
| Nesseth Eiendom Og Holding AS | Tynset | 1988 |
| Nick Sayers Geological Services Limited Nuf | Dt 6Pe Dorset | 2024 |
| Nico Drilling AS | Haslum | 2018 |
| Nils Cato Glamsland AS | Lillesand | 2007 |
| Nine Downhole Norway AS | Ytre Arna | 2018 |
| Nissedal Sandforedling AS | Treungen | 1992 |
| Nitrogas AS | Stavanger | 2012 |
| NLG Holding AS | Oslo | 2005 |
| NN Betong Saging/Kjerneboring AS | Finnsnes | 2016 |
| Noble Drilling (Norway) AS | Stavanger | 2000 |
| Noble Integrator Operations AS | Stavanger | 2018 |
| Noble Intrepid Operations AS | Stavanger | 2018 |
| Noble Invincible Operations AS | Stavanger | 2022 |
| Nome Pukk AS | Lunde | 2011 |
| Nome Sandtak Ans | Øyslebø | 2000 |
| Nor Aggregates AS | Ølensvåg | 2015 |
| Noram Drilling AS | Oslo | 2007 |
| Norblock A/S | Tønsberg | 1987 |
| Nord AS | Oslo | 2005 |
| Nord Troms Maskin Og Anlegg Drift AS | Sørstraumen | 2015 |
| Nord-Berg AS | Ulsteinvik | 1990 |
| Nordby Pukk AS | Degernes | 1997 |
| Nordfjord Skifer AS | Breim | 2000 |
| Nordhordland Stein AS | Voss | 2015 |
| Nordic Minerals AS | Oslo | 2025 |
| Nordic Mining ASA | Oslo | 2006 |
| Nordic Quartz AS | Oslo | 2011 |
| Nordic Subsea AS | Saksvik | 2006 |
| Nordic Titanium AS | Oslo | 2011 |
| Nordisk Pukk Og Sand AS | Kongsberg | 2018 |
| Nordkalk Aktiebolag Nuf | 73129 Köping | 2011 |
| Nordli Eiendom AS | Skarnes | 2002 |
| Nordli Holding AS | Skarnes | 1972 |
| Nordstein AS | Hareid | 2024 |
| Nordtorp Grustak AS | Heggenes | 2006 |
| Norge Mineraler AS | Egersund | 1995 |
| Norge Mineraler Holding AS | Egersund | 2023 |
| Norgia Uab Nuf | Lt-94282 Klaipeda | 2015 |
| Norkalsitt AS | Oslo | 1990 |
| Normand Drift AS | Skudeneshavn | 1997 |
| Normand Superior AS | Skudeneshavn | 2015 |
| Normin Mine AS | Mosjøen | 2009 |
| Norminol AS | Tromsø | 1990 |
| Norock & Co AS | Oslo | 1987 |
| Norse Diamond Drilling AS | Storforsheia | 2021 |
| Norse Energy Ventures AS | Oslo | 2018 |
| Norse Minerals AS | Oslo | 2007 |
| Norsk Herregårdssingel AS | Skjold | 2026 |
| Norsk Marmor AS | Velfjord | 1989 |
| Norsk Massehåndtering AS | Solbergelva | 2021 |
| Norsk Mineral AS | Molde | 2004 |
| Norsk Pukkservice AS | Stathelle | 2008 |
| Norsk Svalbardolje AS KS | Stavanger | 1969 |
| Norsk Uteservice AS | Hakadal | 2023 |
| Norskan AS | Storebø | 2003 |
| Norske Kritiske Metaller AS | Kjøpsvik | 2026 |
| Norskyr Ltd | Harrogate Hg2 7Hs England | 2022 |
| Norterminal Floating Storage AS | Oslo | 2005 |
| Norterminal Response AS | Oslo | 2014 |
| North Atlantic AS | Bakkasund | 2012 |
| North East TGL Services Ltd | Gb-Newcastle Upon Tyne Ne12 6Yz | 2018 |
| North Sea Commander Shipping AS | Bakkasund | 2005 |
| North Sea Enabler AS | Bakkasund | 2023 |
| North Sea Giant AS | Bakkasund | 2014 |
| North Sea Giant II AS | Bakkasund | 2019 |
| North Sea Infrastructure AS | Stavanger | 2017 |
| North Sea Offshore AS | Bakkasund | 2011 |
| North Sea Rigs AS | Sandnes | 2011 |
| North Sea Shipping AS | Bakkasund | 1998 |
| North Sea Shipping Holding AS | Bakkasund | 1987 |
| North Sea Stone Industry AS | Larvik | 1996 |
| Northern Iron | West Perth Western Australia | 2010 |
| Northern Ocean Services Ltd T | Middlesbrough England | 1995 |
| Northern Ocean Wave AS | Stavanger | 2021 |
| Northern Ocean Wind AS | Stavanger | 2022 |
| Norwegian Anorthosite AS | Bergen | 2021 |
| Norwegian Edelsplitt AS | Hellvik | 1991 |
| Norwegian Rose AS | Fauske | 2000 |