The Denius system was a star system in Federation space.

In the years before 2365, the Federation had founded an archaeological outpost on Denius III to study the ancient ruins found there.

The USS Yamato would visit this system in 2365. While there, the captain of the starship was gifted by the head of the outpost, Dr. Ramsey, with an Iconian device. (TNG: "Contagion")

• Denius (primary)
  • Denius I
  • Denius II
  • Denius III