UN Chief, Antonio Guterres on Wednesday called US to lift ban on travelers from the seven Muslim-majority coutries.
Guterres said such measures would not bar terrorists from entering the United States.
Last week, US President Donald Trump signed an executive order for immediate ban and suspension of all refugees for a minimum of 120 days.
Countries affected by the order include, citizens from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen.
The UN Chief addressing on the travel ban and suspension of refugee resettlement appealed on the United States to reverse the order.
"Those measures indeed violate our basic principles and I think that they are not effective if the objective is to, really, avoid terrorists to enter the United States," he said.
"I strongly hope that the US will be able to re-establish its very solid refugee protection in resettlement and I hope that the Syrians will not be excluded in that process."
The executive order by President Trump triggered protests and chaos at airports. Separately, UN human rights chief Zeid bin Ra'ad Zeid al-Hussein declared the order as illegal and "mean-spirited."
