The Dosa system was a star system located in the Gamma Quadrant. (Last Unicorn RPG module: Star Trek: Deep Space Nine Core Game Book)

It contained a single star, an M class red star with a brightness of magnitude +9. (ST reference: Star Charts) It had a number of planets, including Dosa II, which was the homeworld of the Dosi race. As such, the system was controlled by the Dosi Confederation. (Last Unicorn RPG module: Star Trek: Deep Space Nine Core Game Book)