The move, organised by the National Unity Gathering, will be held under the title Unity and Dialogue.
It is expected to attract tens of thousands of supporters just as last Monday's demonstration, said gathering member Faisal Fulad.
"We anticipate that the rally this time will attract the same number of supporters or even more," he said.
"The rally is to stress the importance of national unity for the country and how dialogue can get Bahrain to a better place."
The gathering will also feature a new statement by the National Unity Gathering, to be read by chairman and spokesman Dr Abdullatif Al Mahmood.
The event will begin at 6pm.
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