"The people have the right to protest peacefully" on August 14 to mark the 42nd anniversary of British forces pulling out of the Gulf kingdom, said the Al-Wefaq movement.
Al-Wefaq urged the authorities not to use the demonstrations as a pretext to crackdown on the opposition and launch widespread arrests.
"This will not solve the political crisis. The solution is in satisfying the people's aspirations for liberty, social justice and democracy," said the Shiite movement.
It referred to calls for demonstrations to be held on August 14 under the slogan "Bahrain Tamarod" -- rebellion in Arabic.
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The calls were made by the Bahrain Rebellion Movement which issued its first communique online on July 3 -- the day Egypt's Islamist leader Mohamed Mursi was ousted in a military coup after a grassroots movement called Tamarod organised massive nationwide demonstrations demanding he resigns.
The interior ministry warned security forces would "deal with any attempt to disturb security and stability".
At least 80 people have been killed in Bahrain since the protests erupted, according to the International Federation for Human Rights.