| Nonstop | |
| Norbsoft Sp. z o.o. | |
| Nord Elektronik Kaźmierczak S.C. | Pomeranian |
| NordCom | Podlaskie |
| NORIA Sp. z o.o. | Masovian |
| Nornet | Greater Poland |
| Notebook Master Centrum Szkoleń i Serwis S.C. | Lesser Poland |
| Notebooki.pl | Lower Silesian |
| Nous | Masovian |
| NovCare | |
| Novo Tech Sp. z o.o. | |
| Novomatic Technologies Poland | |
| Novum Sp. z o.o. | Podlaskie |
| Now-IT | |
| NQ.pl | Lesser Poland |
| NRC | Masovian |
| NS Automatyka Sp. z.o.o. | Subcarpathian |
| NS Code Sp. z o.o. Sp.k. | Silesian |
| NS Systemy | |
| NT GROUP Systemy Informatyczne Sp. z o.o. | Łódź |
| Nueko Digital | Silesian |
| o12.pl | Lesser Poland |
| O4 Coworking | |
| ODG Sp. z o.o. | |
| ODL Sp. z o.o. | Masovian |
| OF.pl Sp. z o.o. | Silesian |
| Office & Cowork Centre Sp. z o.o. | |
| Office Sp. z o.o. | |
| OfficeFinder.pl | |
| OFFNET | Lesser Poland |
| Okinet S.C. | Lower Silesian |
| OLE Holding Sp. z o.o. | |
| Olicom | Greater Poland |
| Olimpiada Informatyczna | Masovian |
| Olimpiada Matematyczna | Masovian |
| Omegasoft.pl | Silesian |
| Omni Calculator Sp. z o.o. | |
| Omnipack Sp. z o.o. | |
| One More Level S.A. | |
| One System Sp.z o.o. | |
| one-third of all smartphones | Masovian |
| OneMeter Sp. z o.o. | |
| Online Venture Sp. z o.o. | |
| OnlineCRF, LLC | |
| Onteon Tech Sp. z o.o. | |
| Onteon Tech Sp. z o.o. | |
| Onyx Sp. z o.o. | Masovian |
| Opcja Sp. z o.o. | Masovian |
| Opcode.pl | Silesian |
| Opennet.pl | Masovian |