The Epsilon Nel system (or Nel system) was an inhabited planetary system. The system had two inhabited planets, including Nel III.

This system was one of eight visited by a group of Ullian telepathic historians in the 2360s, who collected a library of memories from the inhabitants. Soon after the visit, one of the planets in the system, Nel III, reported two unexplained comas. The comas were later determined to be a result of telepathic memory invasion perpetuated by Jev. A person of interest in the case, Tarmin, was exonerated as he was on his species' homeworld at the time of the visit. (TNG: "Violations")

The designation "Epsilon Nel" was seen on a computer monitor in the episode.
According to the Star Trek Encyclopedia (4th ed., vol. 2, p. 72), the Ullians visited this system in 2368.
Community content is available under CC-BY-NC unless otherwise noted.