Ajay Kumar Singh may refer to:
- A. K. Singh (full name Ajay Kumar Singh), Lieutenant Governor of Andaman and Nicobar Islands
- Ajay Kumar Singh (Bihar politician, Bharatiya Janata Party), former member of the Bihar Legislative Assembly
- Ajay Kumar Singh (police officer) (died 2000), Superintendent of Police of Lohardaga district
- Ajay Kumar Singh (Uttar Pradesh politician), member of the Legislative Assembly of India
- Ajay Kumar Singh (Bihar politician, Rashtriya Janata Dal), member of the Bihar Legislative Council