Jason Carmody was a villainous Federation Starfleet officer and an antagonist in the Star Trek novel Renegade.
At one time Carmody had commanded the USS Chafee. He was relieved of command and placed under arrest after using his phaser to kill a number of people on Delar Seven in response to an attack by its inhabitants upon his crew. Placed in the brig he faced court martial for his crimes, but the Klingons captured the Chafee and found Carmody in the brig. They freed Carmody from confinement, who agreed to work for them as an agent.
The Klingons involved him in a plot to destabilize the region around the planet Chyrellka. As part of the plot, Carmody recruited the disgraced Starfleet officer Ben Finney, leading Finney to believe that he was being given another chance to wreck the career of Captain Kirk. Carmody assumed the identity of Premier Kaulidren of Chyrellka and when invited to the USS Enterprise for peace talks, insisted on using a shuttle, pretending to be afraid of transporters. This was a ruse to get Finney close enough to infect the Enterprise computers with a virus that would cause false sensor reasons and provoke Kirk into attacking an unarmed ship full of innocent civilians.
However, Finney soon realized that in addition to false sensor readings, the Klingons were planning to use the virus to disable Starfleet vessels which would enable the Empire to conquer the Federation. Finney found he couldn't go through with the plans and gave Spock the means to clear the Enterprise of the virus. Carmody left in a small Klingon ship, however he overloaded his ship's engines, causing it to explode. Carmody was believed to have died in the explosion.