Koer Singh Kalal
| Bhai Koer Singh Kalal | |
|---|---|
| Born | Bishan Singh or Bishan Chand early 18th century | 
| Occupation | Religious Scholar | 
| Period | 18th century | 
| Subject | Guru Gobind Singh Sikh history | 
| Notable works | Gurbilas Patshahi 10 | 
Bhai Koer Singh or Kuir Singh was an 18th-century Sikh scholar who is most famously known for authoring Gurbilas Patshahi Das. It provides a detailed account surrounding the life of Tenth Sikh Guru, Guru Gobind Singh and the origins of the Khalsa. It is regarded as the first reliable and comprehensive source as he was also a close companion of Bhai Mani Singh.