2 Enkelte aksjeinteresser 1997
| | Aksjekapital | Eierandel |
| | (1 000) | % | A/S Olivin |
| Moxy Trucks AS | NOK | 40 000 | 100 |
| Industrimineraler AS | NOK | 2 000 | 75 |
| Imin AS | NOK | 120 | 100 |
| Svalbard Samfunnsdrift A/S |
| | |
| Svalbard Næringsutvikling A/S | NOK | 5 100 | 100 |
| Svalbard ServiceSenter as | NOK | 7 000 | 100 |
| Svalbard Næringsbygg A/S | NOK | 2 000 | 100 |
| Norsk Hydro ASA |
| Polybulk AB | SEK | 102 | 100 |
| A/S Norsk Forkonservering | NOK | 150 | 100 |
| Centro Agroquimico, S.A. | GTQ | 15 | 100 |
| Hydro Agri Argentina, S.A. | ARS | 12 | 100 |
| Hydro Agri Columbia Ltda. | COP | 5 274 | 100 |
| Hydro Agri Costa Rica S.A. | CRC | 1 188 | 100 |
| Hydro Agri Russland AS | NOK | 50 | 100 |
| Hydro Agri Uruguay S.A. | UYU | 18 | 100 |
| Hydro Agri Venezuela C.A. | VEB | 15 300 | 60 |
| Hydro Nordic, S.A | GTQ | 4 845 | 51 |
| Hydroship a.s | NOK | 80 000 | 100 |
| Hydroship Services AS | NOK | 49 950 | 100 |
| Norensacados C.A. | VEB | 500 | 100 |
| Norsk Hydro Chile S.A. | CLP | 286 650 | 100 |
| Norsk Hydro (Far East) Ltd. | HKD | 50 | 100 |
| Norsk Hydro Fosfat a.s | NOK | 18 500 | 100 |
| Norsk Hydro Egypt Ltd. | EGP | 50 | 98 |
| Ceylon Oxygen Ltd. | LKR | 90 000 | 67,3 |
| Geonor a.s | NOK | 4 035 | 66 |
| Hydelko Management AS | NOK | 78 | 87,8 |
| Hydro Chemicals Norge AS | NOK | 5 050 | 100 |
| Hydro Wax AS | NOK | 3 750 | 100 |
| Hydrogas a.s | NOK | 10 000 | 100 |
| Inexsys AS | NOK | 350 | 100 |
| Hydro Megon AS | NOK | 1 400 | 100 |
| Hydro Alumineum a.s | NOK | 2 167 001 | 100 |
| Norsk Hydro Magnesiumgesellschaft mbH | DEM | 7 000 | 2 |
| Kirk Precision Ltd. | GBP | 1 | 100 |
| Norsk Hydro Kraft OY | FIM | 100 | 100 |
| A/S Svælgfos | NOK | 800 | 100 |
| Mabo AS | NOK | 10 000 | 100 |
| Norsk Hydro Plast OY | FIM | 100 | 100 |
| Raufoss ASA |
| Raufoss Metall GmbH | | | 100 |
| Raufoss France SARL | | | |
| Raufoss do Brasil Ltda | | | |
| Raufoss VOD-KA | | | 51 |
| United Parts Truck Systems & Components | | | 100 |
| Kongsberg-Raufoss AS | NOK | 500 | 50 |
| Raufoss Plastal Components AB | SEK | 9 000 | 50 |
| Kongsberg Gruppen ASA |
| Artios Corporation | USD | 6000 | 4,4 |
| Arianespace | FRF | 270 000 | 0,1 |
| Norsk Jetmotor a.s | NOK | 112 500 | 33,3 |
| Kongsberg-Raufoss AS | NOK | 500 | 50 |
| Norsk Jetmotor |
| Kongsberg Maskinservice A/S | NOK | 500 000 | 50 |