| Client name | City | Country |
|---|---|---|
| Nouryon Industrial Chemicals | Frankfurt am Main | Germany |
| NOVARGI INDUSTRIES S.L. | Vitoria Gasteiz, Álava | Spain |
| Novartis AG | Basel | Switzerland |
| Novartis Services AG | Basel | Switzerland |
| NPP Belenergokip LLC | Minsk | Belarus |
| Nuclear Power Corporation of India Limited | Mumbai | India |
| Nufarm GmbH & Co. KG | Linz | Austria |
| NUKEM Technologies Engineering Services GmbH | Alzenau | Germany |
| NUKEM Technologies GmbH | Alzenau | Germany |
| Nuovo Pignone Tecnologie S.r.l. | Firenze | Italy |
| Nuplex Resins GmbH | Bitterfeld Wolfen | Germany |
| Nutrien | Geismar | United States |
| Nynas GmbH & Co. KG | Hamburg | Germany |
| Nynas GmbH & Company KG | Hamburg | Germany |
| Oceanic Controls Pty Ltd | Sumner | Australia |
| OCI Nitrogen B.V. | Geleen | Netherlands |
| ODUM Energy FZE | Lagos | Nigeria |
| Ohl Gutermuth Industrial Valves GmbH | Altenstadt | Germany |
| Oil and Natural Gas Corporation Limited | Delhi | India |
| OKSAN Otomatik Kontrol Sanayi ve Ticaret | Istanbul | Turkey |
| Olin Corporation | Plaquemine | United States |
| Olin Corporation | Cleveland | United States |
| Omega | - | Norway |
| OMV Austria Exploration & Production GmbH | Gänserndorf | Austria |
| OMV Deutschland GmbH | Burghausen | Germany |
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