The defendants, however, have denied the charges and said they had been tortured into making confessions, AFP reported.
Bahrain has handed long jail terms to anti-regime protesters as part of its crackdown on protests since the beginning of demonstrations in the Persian Gulf country.
A military court in 2011 sentenced prominent human rights activist Abdulhadi al-Khawaja and opposition leader Hassan Mushaima to life imprisonment for participating in demonstrations against the ruling Al Khalifa dynasty. A civilian court upheld the sentences in September 2012.
The Bahraini uprising began in February 2011. The Manama regime promptly launched a brutal crackdown on peaceful protests, calling in Saudi-led Arab forces from neighboring states.
Bahraini protesters say they will continue holding anti-regime demonstrations until their demand for the establishment of a democratically-elected government is met.