21 June 1945 
Chennai, Tamil Nadu, India
Thiagarajan made his acting debut with Alaigal Oivathillai appearing as the elder brother of film's lead actress Radha. The film became successful and offers poured in for him. His portrayal of jungle bandit in Malaiyoor Mambattiyan provided him major breakthrough in his career. He was also a part of successful films like Neengal Kettavai, Payum Puli. He acted in Malayalam film New Delhi which became successful and his portrayal of a goon received acclaim. The success of the film prompted Thiagarajan to make his directorial debut titled Salem Vishnu based on the character which he had played in that film. He then directed Aanazhagan with his son Prashanth in the leading role. Prashanth appeared in a drag role and revealed that the most daunting aspects of the role were the "waxing, the threading, the works" as well as "wearing a sari in summer, doing a bharatanatya sequence in a woman's costume, and getting the nuances and variations right were the other challenges", revealing his mum had assisted him. According to Prashanth, the film was an average grosser. Thiagarajan then stayed away from limelight paving way for his son. Thiagarajan then returned to acting appearing in a small role as a father to his son in Jai. Thiagarajan then directed Shock, remake of Hindi film Bhoot in 2004. Apart from directing and producing the film, Thiagarjan handled art and costumes department and also appeared in the film as police inspector. The film's shoot was completed within twenty six days, with meticulous pre-planning arranged by Thiagarajan. The film received positive reviews citing that makers "deserve an appreciation for his honest and sincere attempt on the screen". In September 2004, Thiagarajan launched Police, a remake of the Hindi film Khakee and the film received coverage from the media after producers had approached Amitabh Bachchan and Aishwarya Rai for key roles. In interviews during the period, Thiagarajan mentioned the grand scale of the project citing that schedules would also be shot abroad; however the film failed to progress. He then returned to acting with films Bodyguard, Drohi and Vaaimai. In early 2007, Thiagarajan approached M. Karunanidhi with the intention of making a film on his adaptation of the Ponnar Shankar epic that he had written in the late 1970s. The latter accepted Thiagarajan's offer and approved of his decision to cast his son, Prashanth, in the dual lead roles. The film was released in 2011 to mixed reviews and did average business. In the following year, Thiagarajan directed Mambattiyan, remake of his successful 1983 film which he had acted. His son played the titular role. The film received mixed reviews by critics, it took a good opening at the box office, but petered out to do average business commercially and due to its big budget, failed to recover costs. In 2014, he revealed that he would direct the remakes of Hindi films Special 26 and Queen in four south Indian languages.
|Tik Tik Tik||Tamil|
|Avanukku nigar avane||Tamil|
|Nenjil Oru Ragam||Tamil|
|Bhagavathipuram Railway Gate||Tamil|
|Ethanai Konam Ethanai Parvai||Tamil|
|Ennai Paar En Azhagai Paar||Tamil|
|1984||John Jani Janardhan||Hindi|
|1987||New Delhi||Nataraj Vishnu a.k.a. Salem Vishnu||Malayalam|
|Oru Muthassi Katha||Chemparundu Machan||Malayalam|
|Anthima Theerpu||Nataraj Vishnu a.k.a. Salem Vishnu||Telugu|
|New Delhi||Nataraj Vishnu a.k.a. Salem Vishnu||Hindi|
|New Delhi||Nataraj Vishnu a.k.a. Salem Vishnu||Kannada|
|Jeevitham Oru Raagam||Raghavan||Malayalam|
|1990||No.20 Madras Mail||Cameo Appearance||Malayalam|
As director, producer, writer and art director
|1990||Salem Vishnu||Yes||Yes||Yes||No||Tamil||Thiagarajan, Rupini||Protagonist character based on New Delhi|
|1995||Aanazhagan||Yes||No||Yes||No||Tamil||Prashanth, Suneha||Remake of Chitram Bhalare Vichitram|
|1997||Mannava||No||Yes||No||No||Tamil||Prashanth, Sanghavi, Urvashi, Goundamani||Remake of Chitram Bhalare Vichitram|
|2004||Shock||Yes||Yes||Yes||Yes||Tamil||Prashanth, Meena||Remake of Bhoot|
|2004||Jai||No||Yes||No||No||Tamil||Prashanth, Anshu Ambani, Rajkiran||Remake of Aadi|
|2011||Ponnar Shankar||Yes||Yes||No||No||Tamil||Prashanth, Pooja Chopra, Divya Parameshwaran, Rajkiran||Based on Ponnar Shankar|
|2011||Mambattiyan||Yes||Yes||Yes||Yes||Tamil||Prashanth, Meera Jasmine, Prakash Raj, Mumaith Khan, Vadivelu||Remake of Malaiyoor Mambattiyan|
|Yes||No||Tamil||Prashanth, Amanda Rosario||Remake of Julai|
- "Director Thiagarajan on his latest film". The Times of India. March 31, 2011. Retrieved February 16, 2013.
- "The Hindu : It's all about choices".
- "How to train your drag". 22 May 2010 – via The Hindu.
- "The Hindu : Young and mature at once".
- "Reel Talk for 4th October 2002". 25 February 2003.
- "The Hindu : Prashanth in `Shock'".
- "Shock review. Shock Tamil movie review, story, rating - IndiaGlitz.com".
- "Tamil movies : Will Amitabh star in Prashanth's film?".
- "Prashanth, on 'Ponnar-Shankar'".
- "Thiagarajan to direct four remakes of 'Special 26'".