Kerek is an extinct language of Russia of the northern branch of the Chukotko-Kamchatkan languages. On historical linguistic grounds it is most closely related to Koryak (both languages have a merger of the proto-Chuktotian phonemes /*ð/ and /*r/ with /*j/). The next closest relative is Chukchi (/*ð/ and /*r/ are merged, but not /*j/).
In 1997 there were still two speakers remaining, but by 2005 the language was considered extinct. However, according to the 2010 census, there are 10 people claiming to know the Kerek language, a number which may include non-native and partial speakers, as well as non-speakers who claim the language as part of their ethnic heritage. Over the 20th century many members of the Kerek ethnic groupshifted to Chukchi, the language of the majority ethnic group in the area, but now most Chukchis and Kereks speak Russian.