Fateh Singh Rai (Gurmukhi: ਫਤਿਹ ਸਿੰਘ ; 12 December 1699 – 26 December 1705), also referred to with honorifics as Sahib Baba Fateh Singh or Sahibzada Baba Fateh Singh was the fourth and youngest son of Guru Gobind Singh. The honorary prefix, Baba is considered as Learned or Respected, while Sahibzada means the "Prince". Fateh Singh and his elder brother Zorawar Singh Rai are among the most hallowed martyrs in Sikhism.