Darkest Hour is a 2017 British war drama biographical film about Winston Churchill, played by Gary Oldman, in his early days as Prime Minister of the United Kingdom during the Second World War and the May 1940 war cabinet crisis, depicting his refusal to seek a peace treaty with Nazi Germany amid their advance into Western Europe. The film is directed by Joe Wright and written by Anthony McCarten. Along with Oldman, the cast includes Kristin Scott Thomas as Clementine Churchill, Lily James as Elizabeth Layton, Stephen Dillane as Viscount Halifax, Ronald Pickup as Neville Chamberlain, and Ben Mendelsohn as King George VI. The title of the film refers to a phrase describing the early days of the war, which has been widely attributed to Churchill.

Gary Leonard Oldman is an English actor and filmmaker. Known for his versatility and intense acting style, he has received various accolades, including an Academy Award, a Golden Globe Award, and three British Academy Film Awards. His films have grossed over $11 billion worldwide, making him one of the highest-grossing actors of all time.