Donatu V was the inhabited fifth planet of the Donatu system. The system was located in the same quadrant as Sherman's Planet, Deep Space Station K-7, and an unnamed Klingon outpost. Ownership of this planet, as well as the rest of the region, was disputed between the United Federation of Planets and the Klingon Empire from the point of first contact through the late 2260s.
In 2374, during the Dominion War, the Jem'Hadar had destroyed three convoys of Klingon cargo vessels on their way to this planet. For the fourth convoy, the IKS Rotarran was ordered to escort cargo vessels, which included the IKS Par'tok, to Donatu V. The mission was a success. (DS9: "Sons and Daughters")