Mard was a male Klingon who lived in the 24th century.
In 2369, Mard was alleged to have killed the sister, and her husband, of Captain K'Leht and was being taken to Qo'noS aboard the IKS Khitomer's Revenge for trial. K'Leht planned to seek medical attention for Mard on Deep Space 9 and let him escape, hoping the space station crew would kill his prisoner. Mard escaped, due to his chains not being locked, and took Julian Bashir hostage. Kira Nerys gained access to Klingon records and learned the truth and Benjamin Sisko threatened to tell the Klingon High Command everything he knew if Mard did not get to Qo'noS safely. (DS9 comic: "Hostage Situation")