The Syrian Network for Human Rights said in a statement on Tuesday that at least 61 civilians have been killed by Syrian regime forces since the beginning of the UN-sponsored peace talks in Geneva last week.
The London-based watchdog reported that the victims included 14 children and 19 women who were killed in attacks by Syrian regime forces and its allies.
According to the group, the highest number of fatalities was reported in the northern city of Aleppo.
The Geneva meeting between representatives of the Syrian regime and the opposition is the first UN-mediated peace talk in two years, .
The UN said that it was aiming for six months of talks, first seeking a ceasefire and later working toward a political settlement for Syria.
Syria has been suffering from a civil war since early 2011 when the Syrian regime brutally cracked down on pro-democracy protests.
Since then, more than 250,000 people have been killed and more than 10 million displaced from their homes in the nearly five-year conflict, according to UN figures.