Nelvana system
The Nelvana system was an uninhabited planetary system in the Beta Quadrant. This system consisted of the primary Sigma Nelvana and five planets. 

In 2259, the location of this system was labeled on a stellar cartography chart seen on the 's ready room viewscreen. The system's symbol had a green color, indicating that it was affiliated with the Romulan Star Empire. ()

During the mid-24th century, the system was a strategically significant point in the Romulan Neutral Zone. From this system, the Romulan Star Empire was within striking distance of fifteen Federation sectors.

In 2366, the Romulans deceived the Federation into believing they had established a secret base on Nelvana III, and successfully lured the  there to respond. ()

In 2399, the location of Nelvana was labeled on a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. This system was in or near to space claimed by the Romulan Free State. () 

In 3190, the location of Nelvana was labeled on a star chart used by Commander Paul Stamets for tracking the movement of the Dark Matter Anomaly through the galaxy. ()

de:Nelvana-System
ja:ネルヴァナ星系
nl:Nelvana systeem
Romulan Neutral Zone
Star systems