Arulnithi Tamilarasu is an Indian Tamil actor, who is best known for playing the lead role in Vamsam, directed by Pandiraj.

His second film was Udhayan in which he played a dual role for the first time. His third film Mouna Guru directed by debutant Santhakumar was a critically acclaimed sleeper hit which was also screened at the Hong Kong International Film Festival 2013.