A single Baronetcy was created for persons with the surname Blackadder, in the Baronetage of Nova Scotia. The title is currently dormant.
The Blackadder Baronetcy, of Tulliallin, Perth, was created in the Baronetage of Nova Scotia on 28 July 1626 for John Blackadder. He was profligate spender, and impoverished the estates and title, eventually moving to the continent and dying in America. He married a daughter of John Graham, 6th Earl of Menteith and had issue, but owing to the bankruptcy of the honour it was never claimed and the title remained dormant after John's death.