The Nelvana system was an uninhabited planetary system that consisted of the primary Sigma Nelvana and five planets. 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 USS Enterprise-D there to respond. (TNG: "The Defector")

According to Star Trek: Star Charts (p. 66) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Nelvana system was located in the Beta Quadrant.
It was named for the Canadian animation studio, Nelvana Limited. (Star Trek: The Next Generation Companion) p. 111.
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