Dookudu (transl. Aggressive) is a 2011 Indian Telugu-language action comedy film directed by Srinu Vaitla and written by Vaitla, Kona Venkat, and Gopimohan. It is produced by Ram Achanta, Gopi Achanta, and Anil Sunkara under the banner 14 Reels Entertainment. The film stars Mahesh Babu, Samantha, Prakash Raj, and Sonu Sood alongside Brahmanandam who played a supporting role. The film revolves around Ajay Kumar (Babu), a police officer and son of ex-MLA Shankar Narayana (Raj), who awakes from coma, but his health remains perilous. To aid his recovery, Kumar masquerades as a MLA fulfilling his father's ambition for him, while also hunting his father's foes. The film was inspired by the 2003 German film Good Bye, Lenin!.

The film began production on 28 June 2010 at Hyderabad. Shooting began on 22 October 2010 in Turkey and lasted till mid-September 2011. The film was predominantly shot in Hyderabad, with portions shot in Mumbai, Gujarat, Istanbul, Dubai, and Switzerland. S. Thaman composed the music and M. R. Varma edited the film, while K. V. Guhan handled the cinematography after Prasad Murella left the project mid-way.

Dookudu was released on 23 September 2011 on 1800 screens worldwide. Upon release, Dookudu received positive reviews and was declared a success at the box-office. It was cited as "The biggest hit you've never heard of" by the Los Angeles Times. The film collected a distributor share of ₹58.9 crore in its lifetime and grossed more than ₹101 crore in its lifetime making it the highest-grossing Telugu film of that year and the second highest-grossing Telugu film of all time. In addition, the film won various accolades, which include seven Nandi Awards, six Filmfare Awards, eight SIIMA Awards and eight CineMAA Awards.

The film was remade in Bengali in 2012 as Challenge 2 and in Kannada in 2014 as Power. It was dubbed in Hindi as The Real Tiger in 2012 and in 2013, in Tamil as Athiradi Vettai and in Malayalam as Choodan, in Odia under the same title in 2018, and in Kannada as Police Power in 2021 despite the existence of a remake in said language.