Sathyan Sivakumar known mononymously as Sathyan, is an Indian actor and comedian who works in Tamil cinema. He is the only son of veteran producer Madhampatty Sivakumar. Making his debut as a junior artist in the movie Poovum Puyalum and as the lead in Ilaiyavan, he has subsequently been appearing mainly in supporting and comedic roles in over sixty Tamil films.

Sathyan was born to film producer Mathampatti Sivakumar. Actor Sathyaraj is his uncle, while Sibiraj is his cousin. Sathyan studied at PSG College of Arts and Science in Coimbatore. After graduating with a BBM degree, he entered the film industry by playing the lead role in the Ilaiyaraaja musical Ilaiyavan, which was produced by his father himself. He then acted in Kanna Unnai Thedukiren, both of these films which featured him in lead role failed at box-office and Sathyan chose to portray comedy roles. He later appeared in a pivotal role in Maayavi (2005), where he worked alongside Suriya and Jyothika.

After a series of small supporting roles, he received another break portraying the role of Srivatsan in Shankar's Nanban (2012) and then featured alongside Vijay again in a pivotal role in A R Murugadoss's Thuppakki. He featured as one of the four main leads in boy-adventure films Onbadhule Guru (2013) and Naveena Saraswathi Sabatham (2013), while also starring in the commercially successful romantic comedy, Raja Rani (2013).