Janusz Aleksander Sanguszko (1712-1775) was a magnate in the Polish-Lithuanian Commonwealth. He held the titles of miecznik and Court Marshal of Lithuania. He was not interested in politics, and spent most of his life using the fortunes previous members of the Sanguszko family gathered, spending it on his lavish lifestyle. Indebted, in 1753 he agreed to divide the ordynacja ostrogoska he inherited from his mother, Marianna Lubomirska, among the members and allies of the familia. This decision, known as the transakcja kolbuszowska, was opposed by the enemy of familia, hetmanJan Klemens Branicki, and was finally accepted by the decision of Sejm (national parliament) in 1766.
