The Penitent Thief, also known as the Good Thief, Wise Thief, Grateful Thief or the Thief on the Cross, is one of two unnamed thieves in Luke's account of the crucifixion of Jesus in the New Testament. The Gospel of Luke describes him asking Jesus to "remember him" when Jesus arrives at his kingdom. The other, as the impenitent thief, challenges Jesus to save himself and both of them to prove that he is the Messiah.
He is officially venerated in the Catholic Church. The Roman Martyrology places his commemoration on 25 March, together with the Feast of the Annunciation, because of the ancient Christian tradition that Christ were crucified and died exactly on the anniversary of Christ's incarnation.
He is given the name Dismas in the Gospel of Nicodemus and is traditionally known in Catholicism as Saint Dismas. Other traditions have bestowed other names:
In Coptic Orthodox tradition and the Narrative of Joseph of Arimathea, he is named Demas.
In the Codex Colbertinus, he is named Zoatham or Zoathan.
In Russian Orthodox tradition, he is named Rakh.