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| Teknisk Innsikt AS | Fåvang | 2024 |
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| Tekniska Byrån Mats Nordahl | Se-574 31 Vetlanda | 2018 |
| Teknografik V/ Erling Andre Nielsen | Dk-4800 Nykøbing F | 2017 |
| Teknologipartner AS | Drammen | 2019 |
| Teknologipunktet AS | Nordfjordeid | 2026 |
| Teknologiverket AS | Fornebu | 2026 |
| Teknomade Systemutvikling AS | Oslo | 2012 |
| Teknopilot AS | Hamar | 2011 |
| Teko Technologies AS | Trondheim | 2025 |
| Tekspire AS | Kristiansand S | 2020 |
| Teksport AS | Molde | 2008 |
| Tekst Forlag AS | Oslo | 2020 |
| Tekst Og Kode AS | Slependen | 2018 |
| Tekstehuset AS | Kolbotn | 2021 |
| Tekstgården Forlag AS | Vråliosen | 2012 |
| Tekvyn AS | Steinkjer | 2025 |
| Tekwisdom Norway AS | Oslo | 2013 |
| Telamon Holding AS | Ås | 2019 |
| Telaris AS | Kristiansand S | 2013 |
| Telavox AS | Oslo | 2015 |
| Telcofy AS | Drøbak | 2025 |
| Telcom AS | Bangsund | 2025 |
| Tele 2 Sverige AB | Se-164 94 Kista | 2023 |
| Tele Com Bergen AS | Nesttun | 1989 |
| Tele Og Data Kjeden AS | Oslo | 2014 |
| Tele Site AS | Askim | 2023 |
| Tele Sør Mobil AS | Søgne | 2025 |
| Tele-Com Midt-Norge AS | Verdal | 2011 |
| Tele-It Limited | Reading Rg10 9Uo | 2015 |
| TELE2TAL Installasjon AS | Hylkje | 2015 |
| TELE7 AS | Billingstad | 2019 |
| Telec AS | Eina | 2005 |
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| Telecom Management Partner AS | Lysaker | 2010 |
| Telecomy AS | Oslo | 2021 |
| Teleconsulting AS | Oslo | 2000 |
| Telefactory AS | Oslo | 2017 |
| Telefag Helgeland AS | Sandnessjøen | 2003 |
| Telefiber AS | Høydalsmo | 2006 |
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| Telegardar SA | Hjartdal | 2006 |
| Telekiosken Eidsvoll AS | Råholt | 2014 |
| Telekjeden Communication AS | Oslo | 2018 |
| Telekom Solutions AS | Drammen | 2024 |
| Telekompetanse AS | Skedsmokorset | 2002 |
| Telemada Ans | Oslo | 1999 |
| Telemark Forlag AS | Treungen | 2018 |
| Telemark Software Solutions AS | Skien | 2025 |
| Telemark Stories AS | Rjukan | 2023 |
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| Telemeny AS | Moss | 2015 |
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| Telen AS | Notodden | 1980 |
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| Telenor Asia Holding AS | Fornebu | 2023 |
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| Telenor Communication II AS | Fornebu | 2001 |
| Telenor Connexion AB | Se-169 41 Solna | 2023 |
| Telenor Consult AS | Fornebu | 1991 |
| Telenor Cyberdefence AS | Fornebu | 2024 |
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| Telenor Digital Infrastructure Holding AS | Fornebu | 2023 |
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| Telenor Festekontrakter AS | Fornebu | 2019 |
| Telenor Fiber AS | Fornebu | 2022 |
| Telenor GSS Pakistan | Pk-44000 Islamabad | 2017 |
| Telenor Gti AS | Fornebu | 2008 |
| Telenor Iot AS | Fornebu | 2025 |
| Telenor KB AS | Fornebu | 2001 |
| Telenor Linx AS | Fornebu | 1995 |
| Telenor Låveveien 55 AS | Fornebu | 2019 |
| Telenor Maritime AS | Arendal | 2002 |
| Telenor Marketplace Invest AS | Fornebu | 2015 |
| Telenor Mobile Holding AS | Fornebu | 2001 |
| Telenor Networks Holding AS | Fornebu | 2001 |
| Telenor Norge AS | Fornebu | 1996 |
| Telenor Pakistan | Islamabad | 2008 |
| Telenor Procurement Company Pte Ltd | Sg-Singapore 078881 | 2022 |
| Telenor Procurement Holding AS | Fornebu | 2023 |
| Telenor Real Estate AS | Fornebu | 2014 |
| Telenor Sovereign Cloud Norway AS | Fornebu | 2025 |
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| Telenor Sverige AB | Se-16 903 Solna | 2010 |
| Telenor Towers Norway AS | Fornebu | 1994 |
| Telenor Tracking Solutions AS | Fornebu | 2023 |
| Telenor Tryvann Radio AS | Fornebu | 2019 |
| Teleplan AS | Lysaker | 1993 |
| Teleplan Consulting AS | Lysaker | 1998 |
| Teleplan Globe AS | Lysaker | 1973 |
| Teleplan Holding AS | Lysaker | 1957 |
| Telepluss AS | Oslo | 2022 |
| Telerion GmbH Nuf | De-68161 Mannheim | 2024 |
| Telerådgiverne Ans | Strømmen | 2006 |
| Telescope AS | Skien | 1996 |
| Telescopeco AS | Oslo | 2021 |
| Teletopia Interactive AS | Oslo | 2001 |