A United Kingdom, the story of the real-life relationship between an African king and the English office worker he married in 1947, has been selected as the opening film of the London international film festival.
The film is billed as having a European premiere in London in October, implying it is likely to have its world premiere at Venice or Toronto film festivals months before.
Khama gave up his royal status, and was elected the first president of an independent Botswana in 1966.
The couple had four children, before Khama died in 1980 and his wife in 2002.