| Netlogiq | Cluj |
| Netopia Group | |
| Netopia Payments | Bucharest |
| Netring Media S.R.L. | Cluj |
| NetRom Premium Software | |
| Netshare | |
| NetSoft S.R.L. | Mureș |
| Netsun Software | Bucharest |
| NETVision System | Bucharest |
| Netvisionsoft | |
| Networking Consulting | |
| NeuralCam S.R.L. | |
| NewsMAN | Bucharest |
| NextGen Communications S.R.L. | Bucharest |
| Nextlab.tech | |
| Nexus GPS Tracking | Bucharest |
| Nexus Media S.R.L. | Iași |
| NoBug | Bucharest |
| NOD Academy | |
| Nod Makerspace | Bucharest |
| NoLimits Technologies | Satu Mare |
| Nordlogic Software | Cluj |
| Noteb | |
| Noumax | Bucharest |
| novaPDF | Cluj |
| Nshost | Cluj |
| NXDATA | |
| O2 Solutions | Cluj |
| OAK3 | |
| Obscuro Labs | |
| OceanoBe Technology | |
| Oceanus Software | Bucharest |
| Octogram | |
| Odas Global Consulting | Cluj |
| Odysee Softserv | Bucharest |
| OferteIT | Sibiu |
| Office Max S.R.L. | Bucharest |
| officerentinfo.ro | |
| Ogre | |
| OkkWebMedia S.R.L. | Cluj |
| Omega Consulting | |
| Omniconvert | Bucharest |
| OMS Software | |
| One Designs | Bucharest |
| One Solution Media & Advertising S.R.L. | |
| OneShopping.ro | Vâlcea |
| Onix S.r.l. | Vâlcea |
| Online Booking Manager S.R.L. | Dolj |
| Online Hub | |
| OPEN Web Design S.R.L. | Brăila |