Mieczysław Moczar (original name Mikołaj Diomko, pseudonym Mietek, December 25, 1913 in Łódź – November 1, 1986) was a Polish communist who played a prominent role in the history of the Polish People's Republic. He is known for his ultranationalist, xenophobic and antisemitic attitude which influenced Polish PZPR Party politics in the late 1960s. During this time, General Moczar and his supporters challenged Władysław Gomułka’s authority.