In Kabbalah, Adam Kadmon also called Adam Elyon, or Adam Ila'ah, sometimes abbreviated as A"K, is the first of Four Worlds that came into being after the contraction of God's infinite light. Adam Kadmon is not the same as the physical Adam Ha-Rishon.

Kabbalah or Qabalah is an esoteric method, discipline and school of thought in Jewish mysticism. A traditional Kabbalist is called a Mekubbal. The definition of Kabbalah varies according to the tradition and aims of those following it, from its origin in medieval Judaism to its later adaptations in Western esotericism. Jewish Kabbalah is a set of esoteric teachings meant to explain the relationship between the unchanging, eternal God—the mysterious Ein Sof —and the mortal, finite universe. It forms the foundation of mystical religious interpretations within Judaism.