The protests were staged on Thursday in the villages of al-Daih and al-Musalla, both located west of the capital Manama, the opposition al-Wefaq Society reported.
The protesters condemned the Bahraini court ruling, and called for the release of all prisoners of conscience, including Sheikh Ali Salman, the secretary general of the main opposition party, al-Wefaq.
Earlier on Thursday, the Bahraini supreme criminal court sentenced three people to death and seven others to life in prison after convicting them of allegedly killing three policemen in the village of al-Daih last year.
The court also revoked the Bahraini citizenship of the eight defendants, Press TV reported.
On March 3, three police officers, one from the United Arab Emirates (UAE), were killed in a bomb attack in the village.
However, no group claimed responsibility for the explosion, which occurred as Bahraini troops attacked the mourners of an anti-regime activist, who had died in prison a few days ago.
Since mid-February 2011, thousands of anti-regime protesters have held numerous demonstrations on the streets of Bahrain, calling for the Al Khalifa family to relinquish power.