According to al-Lulu website, it said the fate and conditions of those receiving the death sentence are not clear and their families have no information about their current situation.
It said that the Manama regime does not allow the families to visit or contact their loved ones.
There is no information about where they are being held, the society added.
Al-Wefaq underlined that the confessions based on which they were charged have been obtained by torture and other forms of duress.
In December, a High Military Court in Bahrain sentenced six individuals to death over alleged involvement in terror acts.
The court also convicted and sentenced seven defendants to seven years’ incarceration and stripped their Bahraini nationality.
Recently, al-Wefaq in a statement slammed military trials of civilians as a violation of both domestic and international laws.
On March 5, Bahrain approved the trial of civilians at military tribunals in a measure blasted by human rights campaigners as being tantamount to imposition of an undeclared martial law countrywide.