- Birthday: 02. May 1934
- Birthplace: Chennai, Tamil Nadu, India
K. Balaji (5 August 1934 – 2 May 2009) was a South Indian producer and actor whose work included Rajinikanth' s Billa and Kamal Haasan' s Vazhvey Maayam. Superstar Mohanlal is his son-in-law.
Balaji was born in a prominent Tamil Brahmin (Iyengar) family and was the grandson of a very prominent colonial era advocate T. Rangachari. He wandered into films after developing a taste for acting by performing the odd school play and amateur theatre shows.