The World Service has to find savings of more than 16 per cent – or £67 million – over the next four years according to the terms set out in the government's comprehensive spending review, sparking fears that around 300 jobs could be cut.
An announcement from the service on cuts was postponed in November last year but it is now expected tomorrow.
Union leaders at the World Service have also written to the chair of the House of Commons Foreign Affairs Committee Richard Ottaway and the chair of the Culture Media and Sport Committee John Whittingdale, calling on them to review the BBC's planned cuts.
In a release, the NUJ repeats the concerns of its members raised in the letter, including the fear that many language services will be closed or downgraded in key parts of the world.
"At the same time the BBC World Service News and Current Affairs department will be severely affected," the journalists have reportedly written.
"The World Service newsroom still provides the core journalism for the bulk of the World Service and plays an essential role in the BBC's international news coverage.
"Yet its fate is uncertain and we are concerned that is being systemically dismantled in favour of an alternative structure that we do not believe will work."
The protest will take place at 1pm tomorrow at the Aldwych entrance to BBC Bush House in London, where the World Service is based.
The BBC has not yet responded to a request for comment.
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