C. Krishnan may refer to:
- C. Krishnan (MDMK politician) (born 1936), member of the 14th Lok Sabha of India
- C. Krishnan (AIADMK politician), Indian politician and member of the Tamil Nadu Legislative Assembly
- C. Krishnan (Kanyakumari MLA), Indian politician and former Member of the Legislative Assembly
- C. Krishnan (CPI-M), Indian politician