About 200 members of the National Union of Journalists at BBC Scotland will strike in a row over job losses.
Jobs are being lost across the corporation, including 17 in news and current affairs in Scotland. Picket lines will be mounted outside all BBC offices today, including Pacific Quay in Glasgow.
Paul Holleran, Scottish organiser of the NUJ, said: "I think we are going to see significant disruption in Scotland and across the UK. In Scotland, we think the whole newsroom will be out. There might be some unfamiliar voices on TV and radio and some shows might be cancelled."
BBC Scotland would not speculate on disruption last night, but a spokesman said: "Our priority is to deliver scheduled services to viewers and listeners. It is too early to speculate on potential changes to the schedule or which services may be affected.
"We understand how frustrating and difficult situations involving redundancies can be, but it is disappointing the NUJ have chosen to take this action.
"We are working hard to ensure we succeed in getting staff redeployed wherever we can and will continue to work with the unions to ensure their members receive the right redeployment support."
Michelle Stanistreet, NUJ general secretary, said: "NUJ members across the BBC are taking action to defend jobs and quality journalism."