Sivaji: The Boss is a 2007 Indian Tamil-language action drama film co-written and directed by S. Shankar and produced by AVM Productions. The film stars Rajinikanth and Shriya Saran in the lead roles, with Vivek, Suman, Sathyan, Manivannan and Raghuvaran playing pivotal roles. In the film, Sivaji is a software systems architect, who returns to India in order to provide free medical treatment and education, but has to face hurdles from the system and Aathisheshan, an influential political leader.

A. R. Rahman composed the soundtrack and background score (in his 100th milestone composition), while Thota Tharani and K. V. Anand were the film's art director and cinematographer respectively. With a budget of ₹60 crore (US$7.5 million), the film was the most expensive Indian film at the time of its release. Rajinikanth also became the highest-paid Indian actor with this film, earning a fees of around ₹26 crore (US$3.3 million). Principal photography of the film commenced in November 2005 and lasted till February 2007. Filming took place in various locations across Hyderabad, Spain, Italy, New York City, Pune and Chennai and also became the first Indian film to use Dolby Atmos surround sound technology.

Released on 15 June 2007, Sivaji: The Boss received positive reviews from critics and became a commercial success by grossing ₹100—160 crore worldwide. It emerged as the highest-grossing Tamil film at the time of its release and went on to win a National Film Award, three Filmfare Awards and two Vijay Awards. The film was converted into 3D and released on 12 December 2012 as Sivaji 3D. The runtime of the 3D version was shorter than the original, cut to 155 minutes.

It marked the final film of K. V. Anand as a cinematographer.