District 9 is a 2009 science fiction thriller film directed by Neill Blomkamp. It was written by Blomkamp and Terri Tatchell, and produced by Peter Jackson and Carolynne Cunningham. The film stars Sharlto Copley, Jason Cope, and David James.

The story, adapted from Alive in Joburg, a 2005 short film directed by Blomkamp and produced by Sharlto Copley and Simon Hansen, pivots on the themes of humanity, xenophobia and social segregation. The title and premise of District 9 were inspired by events that took place in District Six, Cape Town during the apartheid era. The film was produced for $30 million and shot on location in Chiawelo, Soweto, presenting fictional interviews, news footage, and video from surveillance cameras in a part-mock documentary style format. A viral marketing campaign began in 2008, at the San Diego Comic-Con, while the theatrical trailer appeared in July 2009. Released by TriStar Pictures, the film opened to critical acclaim on August 14, 2009, in North America and earned $37 million in its opening weekend. Many saw the film as a sleeper hit for achieving success and popularity during its theatrical run, despite a modest budget and relatively unknown cast.

Thirty years ago, aliens made first contact with Earth. Humans waited for the hostile attack, or the giant advances in technology. Neither came. Instead, the aliens were refugees, the last survivors of their home world. The creatures were set up in a makeshift home in South Africa's District 9 as the world's nations argued over what to do with them.

Now, patience over the alien situation has run out. Control over the aliens has been contracted out to Multi-National United (MNU), a private company uninterested in the aliens' welfare—they will receive tremendous profits if they can make the aliens' awesome weaponry work. So far, they have failed; activation of the weaponry requires alien DNA.

The tension between the aliens and the humans comes to a head when an MNU field operative, Wikus van der Merwe, contracts a mysterious virus that begins changing his DNA. Wikus quickly becomes the most hunted man in the world, as well as the most valuable—he is the key to unlocking the secrets of alien technology. Ostracized and friendless, there is only one place left for him to hide: District 9.

The film won the 2010 Saturn Award for Best International Film presented by the Academy of Science Fiction, Fantasy & Horror Films, and was nominated for four Academy Awards in 2010: Best Picture, Best Adapted Screenplay, Best Visual Effects, and Best Editing.

The film received very positive reviews, with Rotten Tomatoes reporting that 91% of critics gave the film a positive review, based on a sample of 244, with an average score of 7.8 out of 10. The website wrote of the consensus, "Technically brilliant and emotionally wrenching, District 9 has action, imagination, and all the elements of a thoroughly entertaining science-fiction classic." At Metacritic, which assigns a weighted average rating out of 100 to reviews from mainstream critics, the film has received a score of 81 based on 36 reviews, indicating "Universal Acclaim". IGN listed District 9 as 24 on a list of the 25 Great Sci-Fi films ever.