The Elcesaites, Elkasaites, Helkesaites, or Elchasaites were an ancient Jewish-Christian sect, a subgroup of the Ebionites, in Sassanid southern Mesopotamia. Some early scholars differentiate Ebionites from Essenic Ebionite-Elchasites. They are discussed by Epiphanius and in pseudo-Clementine literature.