Thiagarajan (disambiguation)

Thiagarajan (Sivanandam) is an Indian actor, director and producer.

Thiagarajan may also refer to:
 * Given name
 * Thiagarajan Kumararaja, Indian film director and screenwriter
 * Thiagarajan Ramani, Indian musician
 * Surname
 * A. Thiagarajan, Indian politician
 * Karate R. Thiagarajan, Indian politician
 * N. Thiagarajan, Indian photojournalist and photographer
 * N. R. Thiagarajan, Indian freedom fighter, congress leader and social activist
 * Palanivel Thiagarajan, Indian politician
 * Periasamy Thiagarajan, Indian politician
 * Prashanth Thiagarajan, Indian actor and businessman
 * Tara Thiagarajan, Indian neuroscientist and entrepreneur
 * T. M. Thiagarajan, Indian vocalist and musicologist