Thousands of Syrians took to the streets, criticising Washington for blacklisting a rebel group and saying that it was President Bashar al-Assad who was a "terrorist".
The protesters on Friday demonstrated under the slogan: "There is no terrorism in Syria except that of Assad."
The US was hoping to marginalise Jubhat al-Nusra when it labelled it a terrorist organisation.
Instead, the group has gained popularity, especially in the villages and towns of Syria.
Al Jazeera's Zeina Khodr reports from Idlib province in northern the country.