The 63-year-old will reprise his role as MI5 spy Johnny Worricker in Turks & Caicos and Salting The Battlefield from writer/director David Hare.
Christopher Walken, Winona Ryder, Helena Bonham Carter and Ralph Fiennes will also star in Turks & Caicos, which will see Worricker forced to deal with an old girlfriend and the CIA.
Salting The Battlefield will show Nighy appear opposite Saskia Reeves, Judy Davis and Ewen Bremner in a tale that sees Worricker in exile and on the run across Europe.
"We have assembled a most extraordinary cast for these two films," said Hare. "I think there may be two reasons - first and foremost, because so many actors want to appear alongside Bill Nighy, but secondly, because people responded so strongly to the feeling of Page Eight – all the fun of spy fiction, I hope, but, for once, bang up to date and based in the real intelligence dilemmas of the last 10 years."
Janice Hadlow, Controller of BBC Two, added: "David Hare's outstanding films and incredible cast are testament to BBC Two's commitment to original British drama and I am delighted to welcome him back to the channel."
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Watch a clip from Page Eight below: