Latest figures from the UN Office of the High Commissioner for Human Rights say that over 93,000 people have died in Syria since November 2012.
Over 80% of the dead are reported to be men, however the report by the OHCHR says over 1,700 children under 10 also died.
There were "cases of individual children being tortured and executed, and entire families, including babies, being massacred - which, along with this devastatingly high death toll, is a terrible reminder of just how vicious this conflict has become," said OHCHR head Navi Pillay.
Pillay said that "states with influence could, if they act collectively, do a lot more to bring the conflict to a swift end, thereby saving countless more lives".
"Civilians are bearing the brunt of widespread, violent and often indiscriminate attacks which are devastating whole swathes of major towns and cities, as well as outlying villages," she added.
The US meanwhile has claimed that the Syrian armed forces have used chemical weapons.
"The president has been clear that the use of chemical weapons - or the transfer of chemical weapons to terrorist groups - is a red line for the US," deputy national security adviser to President Obama, Ben Rhodes said.
"Our intelligence community now has a high confidence assessment that chemical weapons have been used on a small scale by the Assad regime in Syria. The president has said that the use of chemical weapons would change his calculus, and it has."
