Jonathan Deaglan Bismarck (b. January 25, 1950) is a Chawosaurian Sorcerer and the first cousin of Jonathan Dragan Bismarck XIX, a muggle, and a member of the Bismarck Family. Bismarck is the grandson of former Chawosaurian Prime Minister Jonathan Dragan Bismarck XVII (1890-2013). Bismarck was accepted to Hogwarts in 1961 and was sorted into Ravenclaw House, unlike his mother, who was sorted into Hufflepuff House in 1941, and like his mother, against the preference of a parent.

Bismarck, while serving time in Hogwarts between 1961 to 1967, was treated like an outcast over his Slytherin grandfather. Bismarck had been improving his public image by 1965. In the 1965 midterm elections, while his grandfather was still Prime Minister of Chawosauria, Bismarck became a member of the U.K. Labour Party after the 1964 U.K. general election, supporting Harold Wilson and his Labour Party. After graduating from Hogwarts in 1967, Bismarck refused to work for the ministry of magic and decided to live in Chawosauria. He ran for a seat in the Chawopolis Palace in the 1969 midterm elections but was single-handily defeated by his Communist opponent.