To keep up with the pace of technology, and for effective utilization of specific know-hows in implementation of projects, NARGAN has associated itself with a number of reputable international companies. This has been either through joint venture agreements or on subcontracting basis.
Some of the international companies NARGAN has cooperated with are:
| Axens, IFP Group Technologies | France |
| Balfours | UK |
| BP | UK |
| Chiyoda Corporation | Japan |
| Didier Engineering | Germany |
| Eurotecnica, S.p.A. | Italy |
| Foster Wheeler | UK |
| Haldor Topsøe | Denmark |
| John Brown Deutsche Engineering | Germany |
| KBC Process Technology | UK |
| Klockner Stadler Hurter | Canada |
| Linde AG | Germany |
| Air Liquide (formerly Lurgi GmbH) | France / Germany |
| Lyondellbasell (formerly Basell Polyolefins) | Germany |
| Pipeline Technologists Inc. | USA |
| Prosernat, IFP Group Technologies | France |
| Rollechim Impianti | Italy |
| Snamprogetti, S.p.A. | Italy |
| Stamicarbon | Netherlands |
| Technip | France, Benelux, Germany and Italy |
| Tecnimont | Italy |
| Kinetics Technology (formerly Technip KTI) | Italy |
| The Shawinigan Engineering | Canada |
| ThyssenKrupp Industrial Solution (formerly Uhde) | Germany |
| Versalis ENI (formerly Polimeri Europa) | Italy |