Kelvas V was the fifth planet in the Kelvas system, in the Cardassian Union. It was the location of a major repair facility where, in 2375, Breen energy dampening weapons were being installed aboard Jem'Hadar warships. Odo had a number of contacts on Kelvas V, which allowed a small team of the Cardassian Liberation Front to infiltrate the planet and steal one of the modified ships. (DS9: "Tacking Into the Wind")

In the first draft script of "Tacking Into the Wind", this planet was instead named "Semora V".
According to Star Trek: Star Charts (p. 46) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Kelvas system was located in the Alpha Quadrant.