The Bajoran-Cardassian Treaty was an historic peace treaty between Bajor and the Cardassian Union signed in 2371. Vedek Bareil was the chief Bajoran negotiator for the treaty, while Legate Turrel represented the Cardassian Union. Although Bareil was injured and close to death, he helped Winn Adami to finish the negotiations. The signing of the Treaty sent shockwaves throughout the Alpha Quadrant. (DS9: "Life Support")

Even with the new Treaty, the Bajorans were still suspicious of the Cardassians and upgraded the orbital sensor array at Prophet's Landing, the closest Bajoran colony to Cardassian space. (DS9: "Heart of Stone")

The Obsidian Order was strongly opposed to the Treaty and sent an operative, Dejar to sabotage a combined Federation-Bajoran-Cardassian effort to place a subspace relay station in the Gamma Quadrant. (DS9: "Destiny")

In his message to the Cardassian government Enabran Tain mentions the treaty, alongside the Federation-Cardassian Treaty, as the factors that blind it to the danger of the Dominion. (DS9: "The Die is Cast")