SIIMA Award for Best Actor – Tamil is presented by Vibri media group as part of its annual South Indian International Movie Awards, for best acting done by an actor in Tamil films. The award was first given in 2012 for films released in 2011.

Sivakarthikeyan, also known by the initialism SK, is an Indian actor, singer, film producer, lyricist, and television presenter, who works predominantly in Tamil films. He is a recipient of a Tamil Nadu State Film Award, four Edison Awards, four SIIMA Awards, and two other Vijay Awards.