Language services set to be axed are Albanian, Macedonian and Serbian, as well as Portuguese for Africa and the English for the Caribbean regional service, said a statement Tuesday from the British broadcaster.
It is thought around 650 jobs from a workforce of some 2,400 will be lost in a bid to save 46 million pounds (53 million euros, 73 million dollars) a year, the BBC website reported, without citing its sources.
The report also said that a reduction of programmes in another seven languages was to be announced, without giving further details.
A spokesman for the broadcaster refused to confirm the report and said further details would be announced at a staff briefing Wednesday.
Unions blasted the "ferocious cuts" and said they planned to stage a protest outside the World Service head office in central London Wednesday.
The publicly-funded broadcaster said it was trying to make savings after agreeing in October to take over funding of the World Service, which had previously been paid for by the foreign ministry.
This was part of spending reductions at the BBC which in effect mean a 16 percent cut in its budget over six years as the coalition government seeks deep public sector savings.