K. N. Singh
- Birthday: 01. September 1908
- Birthplace: Dehra Dun, United Provinces, British India
K. N. Singh (1 September 1908 – 31 January 2000) was a prominent villain and character actor of Hindi films. K. N. Singh came to acting by way of law, giving up his first career in 1937 to pursue his newfound interest in performance. More often than not, Singh found himself portraying a "gentleman" type of villain, usually costumed in a fine suit and hat, and smoking a pipe. His style included expressive eyes and sarcastic remarks as a ruthless but articulate villain, often playing roles of evil genius, mafia dons who have a double persona to the rest of the world. He also played positive roles in C I D (starring Dev Anand-Shakila), Wo Kaun Thi and Agent Vinod starring Mahendra Sandhu. His career spanned six decades and included over 200 films.