Józef Kazimierz Korwin Kossakowski (16 March 1738 – 9 May 1794), of Ślepowron coat of arms, was a Polish noble, bishop of Livonia from 1781, political activist, writer, and supporter of Russian Empire.

His bishop nominations were a reward for his service to the Russian Empire: they were controlled by Empress Catherine the Great, were not consulted with Rome, and served to both reward Russia's loyalists in their dominions, as well as increase the Russian state's control over the Roman Catholic Church there.

[9] As a vocal supporter and zealous follower of orders from Russian Empire and Empress Catherine the Great[10] he was one of the opponents of the Constitution of 3 May.

A few days before the start of the uprising, Kossakowski suggested that the Russian troops should surround the churches and arrest all known dissidents.

Most of the citizens of Warsaw, whose support was crucial to the uprising, demanded that Kossakowski and others found to be acting on Russia's behalf against the Commonwealth should be executed.