The Krymchaks are Jewish ethno-religious communities of Crimea derived from Turkic-speaking adherents of Rabbinic Judaism. They have historically lived in close proximity to the Crimean Karaites, who follow Karaite Judaism.

The Crimean Karaites or Krymkaraylar, also known as Karaims and Qarays, are an ethnicity of Turkic-speaking adherents of Karaite Judaism in Central and Eastern Europe, especially in the territory of the old Polish-Lithuanian Commonwealth and Crimea. "Karaim" is a Russian, Ukrainian, Belarusian, Polish and Lithuanian name for the community.