Siddharth Suryanarayan (born April 17, 1971) is a Indian actor, playback singer and screenplay writer. After his business management studies, Siddharth chose to work in film making and worked as assistant director before making debut in the Tamil movie Boys. In the subsequent years, he has worked in many Telugu, Hindi and Tamil movies.

Siddharth was born as Siddharth Suryanarayanan in Chennai. He studied at DAV Boy's Senior Secondary School, Chennai and Sardar Patel Vidyalaya, Delhi. He got his B.Com (Honors) degree from Kirori Mal College, New Delhi. Siddharth was popularly known as "Sidy" in school and college, and was part of the reputed theatre group of the college The Players. He was also president of the college's debating society and attended the World Debating Championships. He completed his MBA in 2001 from S.P Jain Institute of Management & Research, Mumbai. He was declared "CNBC Manager of the Year" in 1999. He had a chequered married life, which ended in a divorce.

After his MBA, Siddharth landed the role of assistant director for Mani Ratnam's Kannathil Muthamittal. Screenplay writer Sujatha Rangarajan recommended his name to Shankar for casting in his then upcoming movie Boys. The movie was a moderate success in Tamil but the dubbed version in Telugu gave Siddharth an opening in the Telugu industry.

Siddharth worked on Mani Ratnam`s Aayutha Ezhuthu in 2004 which was dubbed from Tamil into Telugu (Yuva) and he worked with Prabhu Deva in the film Nuvvostanante Nenoddantana that gave his first Filmfare Best Actor award. In 2005, Siddharth also ventured into the writing forum as well as the singing forum as he wrote the screenplay for his Telugu film Chukkallo Chandrudu directed by Siva Kumar and sang as a playback singer. Siddharth debuted in Bollywood as part of the critically acclaimed Rang De Basanti which starred Aamir Khan as a lead. Siddharth received the Star Screen Debut Award for his role as Karan Singhania in the movie. Siddharth's next Telugu film Bommarillu received critical acclaim as well as box office success. He worked with director Vishal Bhardwaj and Oscar winning cinematographer Guillermo Navarro on a short film titled "Blood Brothers" which screened at the Toronto International Film Festival.

After the above average grossing Aata in 2007, Siddharth took a sabbatical and did not have a release for 20 months. In 2009, Konchem Ishtam Konchem Kashtam opposite Tamanna received a good response from the critics and the audiences. Siddharth played the lead role in debutant director Anand Ranga's Oy, which achieved box office success despite mixed reviews. He is awaiting the release of his second Bollywood movie Striker, which is already being touted as an award winning performance.

He has just started work on Prakash Rao's ambitious fantasy epic, produced by veteran K. Raghavendra Rao. Shruti Haasan has been cast opposite Siddharth.

He has also acted for Idea Cellular mobile advertisements.