The drama, which starred Suranne Jones as Doctor Gemma Foster, gripped the nation in September over the space of five episodes.
The finale drew a consolidated audience of 10.1m viewers, and was the highest-rating BBC drama episode this year after Call The Midwife.
The gripping and nail-biting final episode saw Gemma exact her revenge on cheating husband Simon (Bertie Carvel) and his young lover Kate Parks (Jodie Comer).
Suranne said: "After discussions with Drama Republic and the wonderful Mike Bartlett I am thrilled to announce we will all be reunited to tell Gemma's next chapter, and I can't wait for the audience who invested in these characters to find out what explosive twists and turns Mike has in store.
"Now we can look into what happens to a woman after divorce, when deceit and revenge have taken their toll. What a gift of a part and a dream to work with Mike again!"
Produced by Drama Republic, weekly figures of Doctor Foster hit 8.2m, the highest rating for any new TV drama this year.
Creator and writer Mike Bartlett said: "I've been astounded by the response to Doctor Foster. So I'm thrilled that alongside Drama Republic and the phenomenal Suranne Jones, we're now going to tell the next chapter in Gemma's story. Her life in Parminster may look better on the surface, but as she will discover to her cost, every action has its consequences eventually. No one comes through hell unscathed."
Polly Hill, controller of BBC Drama commissioning, added that there will be "many more surprises to come in the next chapter of this powerful drama".
We literally cannot wait!
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