Nikolai Ivanovich Kibalchich (Russian: ??????? ???????? ?????????, Ukrainian: ?????? ???????? ?????????,Serbian: N????? ????????, Mykola Ivanovych Kybalchych; 19 October 1853 – April 3, 1881) was a Russian revolutionary of Ukrainian-serbian origin who took part in the assassination of Tsar Alexander II as the main explosive expert for Narodnaya Volya (the People's Will), and was also a rocket pioneer.
He was the paternal uncle of revolutionary Victor Serge.