Menachem Mendel Morgensztern of Kotzk, better known as the Kotzker Rebbe and the Kotzker (1787–1859) was a Hasidic rabbi and leader.

Kock is a town in eastern Poland, about 45 kilometres north of Lublin and 120 kilometres south-east of Warsaw. It lies in Lublin Voivodeship, in Lubartów County. It is the capital of the administrative district Gmina Kock. Historically Kock belongs to the Polish province of Lesser Poland and is located in its northeastern corner. As of 2004, its population numbered 3,509.