Bedrift I - Harstad
- Industrimontasje AS
- iHarstad
- Idrive AS
- iTet AS
- Iamme AS
- Ingeniørkompaniet ANS
- Informatics AS
- Interacto AS
- Imalo AS
- Iver Jensa AS
- Irene Sørensen
- Ingebyre Omotony
- Ida Sætherbakken
- Imants Bite
- Ibestad Pinsemenighet
- Ingar Aspevoll
- iteam Harstad
- Ibestad Pinsemenighet
- If Skadeforsikring
- Ida Grindahl
- Inko Eiendom AS
- Idrettsråd Harstad
- Inko Holding AS
- Infine AS Konkursbo
- Infine AS Konkursbo
- Idrive Harstad
- Ident Tannteknikk AS
- Inventum Copysafe
- Into Eiendom AS
- Iro Invest AS
- Ingvild Strand
- Inge Jensa AS
- IMTAS Harstad
- Intex Vedlikehold
- Intersport Kanebogen
- Iselin Evensen
- Isotec Harstad AS
- IF Kilkameratene
- Isaksen Marthe
- Ik Hind
- Ingebrigtsen Britt
- Ingebrigtsen Anne Mari
- Inga Helene Juul
- Ib Maler Proff AS
- Isaksen Tove Annie
- Ing. Geir Søreng
- Industriveien 12 Andenes AS
- ISS Facility Service
- Idar Jarle Brendmo
- Intunor Services AS avd Harstad
- IT Partner Harstad AS
- Inger Alvilde Ingemann
- Iliyan Kirilov Kerchev
- Independent MC Harstad
- Intellekt Konsult Andersen
- Industri & Maling AS
- Industri og Anlegg AS
- Industri & Maling AS
- ISS Facility Services AS
- I-A Holding AS
- Inge Bernt Olsen
- Ingunn Jensen Bunadssøm
- Ingeniør Torgeir Hardersen
- Inger Johanne Dybwad
- Ingeborgsh Ingeborg Sandlien Halseth
- International Students Union Hih
- Ingeborg Annie Sivertsen Lindahl
- Interesseforeningen for Radio Harstad
- Inko Industri- og Kompetansesenter AS
- Interflora Troms Nordnorsk Blomsterhandlerforening
- I Saues Møbler AS Viggo
- I Saues Møbler AS Beathe
- I Saues Møbler AS Krystian
- I - Hus V/ Stig Ivetorp
- ISS Service Management AS Avd Renhold Harstad
- Inko AS Avd Vta Harstad Storgt 41
- Industri Energi Equinor - Avdeling Harstad