At least 100 people have now been sentenced to death or charged with capital offences in connection , a rights group says.
Five women were among those at risk of execution, Norway-based Iran Human Rights (IHR) reported.
The real number of protesters facing the death penalty was believed to be far higher because families were being pressured to stay quiet, it warned.
Two men were executed this month after what activists said were sham trials.
Mohsen Shekari and Majidreza Rahnavard, who were both 23, were found guilty by Revolutionary Courts of the vaguely-defined national security charge of “enmity against God
Iran has been engulfed by protests against the country’s clerical establishment for just over 100 days.
They erupted following the death in custody of Mahsa Amini, a 22-year-old woman who was detained by morality police in Tehran on 13 September for allegedly wearing her hijab, or headscarf, “improperly”.
Authorities have portrayed the protests as foreign-backed “riots” and responded with lethal force.
So far, at least 476 protesters have been killed, including 64 children and 34 women, according to IHR.
A report published by the group on Tuesday identified 100 individuals whose sentences or indictments have either been announced by officials or reported by their families or journalists.
All defendants had been “deprived of the right to access their own lawyer, due process and fair trials”, it said.
“In cases where they have managed to make contact, or details of their cases [have been] reported by cellmates and human rights defenders, all have been subjected to physical and mental torture to force false self-incriminating confessions.”
One of those at imminent risk of execution is Mohammad Ghobadlou, 22, who had his death sentence upheld by the Supreme Court on Saturday. He was convicted of “enmity against God” after being accused of driving into a group of policemen during a protest in Tehran in September, killing one of them