Bhai Dayal Das (variously spelt as Bhai Dyala, Dayala, Diala)(died 24 November 1675) was son of Bhai Mati Das and younger brother of martyr Bhai Mani Singh ji. He was one of the earliest and greatest Martyrs to the Sikh faith. Along with his companions Bhai Mati Das and Bhai Sati Das as well as Ninth Guru, Guru Teg Bahadur, Bhai Dayala was martyred at Chandni Chowk at Delhi on 24 November 1675 on account of his refusal to barter his faith. He was the third Sikh to be executed by the Mughals in November 1675 before the Martyrdom of Guru Tegh Bahadar.