The broadcaster teasingly made the announcement with a tweet just minutes after the second series finale finished airing.
Tennant and Colman will reprise their roles as Alec Hardy and Ellie Miller for the third series, the broadcaster said in a statement, adding that the details of other cast members and filming dates will be confirmed later.
Series one of the drama was met by critical acclaim, and explored the consequences of the tragic death of school boy Danny Latimer and the subsequent investigation into who killed him.
The second series, which was less well received, followed the trial of murder suspect Joe Miller’s, as Danny’s family struggled to come to terms with their son’s death, as well as the media spotlight and their desperation for justice to be done.
Creator and writer Chris Chibnall said: “We’ve been overwhelmed that nine million people every week have continued to join us on the twists and turns of Broadchurch. This third chapter has been a glint in my eye for a long time and I’m thrilled to be writing these characters once again."
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