Michal Czajkowski (Ukrainian: Mykhailo Chaikovsky; 29 September 1804 – 18 January 1886), also known in Turkey as Mehmet Sadyk Pasha (Turkish: Mehmet Sadik Pasa), was a Polish writer and political émigré of distant Cossack heritage who worked both for the resurrection of Poland and also for the reestablishment of a Cossack state.