Downton Abbey creator Julian Fellowes will write the screenplay and co-produce the film, as he did with the 2019 instalment.
The first Downton Abbey film, simply titled Downton Abbey, was a box office success, earning more than $230m out of an estimated budget of $13m, according to Box Office Mojo.
The programme’s Twitter account announced the news on Monday in a message that read: “We’re thrilled to announce that Julian Fellowes and the entire Downton cast are back for #DowntonAbbey2.”
All starred in the first Downton Abbey film, released in September 2019.