The Kavarian system was a stellar system that was the location of a covert Breen base during the Dominion War. A prototype encryption device was developed at this base, and Starfleet Intelligence Commander Tobias Donovan infiltrated the base in order kidnap the inventor, and eventually escaped the system in a stolen scout ship. (SCE short story: "Field Expediency")

The Kavarian system is likely to be the home of the Kavarian tiger bat. (DS9 episode: "For the Cause", STA novel: Oblivion)