Brexit: The Uncivil War (simply Brexit in the US) is a 2019 British drama television film written by James Graham and directed by Toby Haynes. It depicts the lead-up to the 2016 referendum through the activities of the strategists behind the Vote Leave campaign, that prompted the United Kingdom to exit the European Union, known as Brexit. Benedict Cumberbatch stars as Dominic Cummings, the Campaign Director of the officially designated Brexit-supporting group, Vote Leave. Rory Kinnear stars as Craig Oliver, one of the leaders of the officially designated Remain-supporting group, Britain Stronger in Europe.

It aired on Channel 4 in the United Kingdom on 7 January, and aired on HBO in the United States on 19 January. The film received generally positive reviews from critics, with praise for its pacing, black comedy, and the depiction of the campaign as a thriller, and with particular praise for Cumberbatch's performance which was likened to his role in the TV series Sherlock. The film received a nomination at the 71st Primetime Emmy Awards for Outstanding Television Movie.