The Oby system was an inhabited star system in Federation space.

The sixth planet experienced a pandemic of plasma plague in the mid-2290s. (TNG: "The Child")

• Oby (primary)
  • Oby I
  • Oby II
  • Oby III
  • Oby IV
  • Oby V
  • Oby VI

There is some uncertainity as to the spelling of this system. Some sources have the name written as Obi.