The First Churchills is a BBC serial from 1969 about the life of John Churchill, 1st Duke of Marlborough, and his wife, Sarah Churchill, Duchess of Marlborough. It stars John Neville as the duke and Susan Hampshire as the duchess, was written and produced by Donald Wilson, and was directed by David Giles. It is notable as being the first programme shown on PBS's long-running Masterpiece series in the United States. Wilson and Giles were fresh from their success in writing and directing The Forsyte Saga, which also starred Susan Hampshire and Margaret Tyzack.

Sarah Churchill, Duchess of Marlborough, Princess of Mindelheim, Countess of Nellenburg, was an English courtier who rose to be one of the most influential women of her time through her close relationship with Anne, Queen of Great Britain. The Duchess of Marlborough's relationship and influence with Anne were widely known, and leading public figures often turned their attentions to her, hoping for favour from Anne.