The Dopa system was an inhabited star system in Cardassian space.

Following the discovery of the attack Korma by the Klingon Bird-of-Prey commanded by K'Temang, Gul Dukat inquired as to the distance of the nearest Cardassian warship, only to learn that the closest warship was probably somewhere in the Dopa system; a three day journey.

Later, when Dukat laid a trap for the same Bird-of-Prey, he claimed that his freighter, the Groumall, was carrying replicator and transporter components to the Dopa system. (DS9: "Return to Grace")