There have been growing reports of racist incidents across the UK since the historic Leave vote win in the EU referendum.
Amnesty has urged politicians and councils to condemn racism and provide support toward helping prevent incidents.
A Belfast nurse was told to "f*** off back to your country" after being asked if he was from the EU during a night out in the city.
Mr Mohammed Samaana, originally from Palestine and now a UK citizen, has lived in Northern Ireland for 15 years was verbally abused while enjoying a night out in a city centre bar on Saturday night.
Patrick Corrigan, Amnesty’s Northern Ireland programme director, said "This racist verbal attack - in a busy Belfast bar - is just the latest reported incident of its type across the country.
"Bigotry and xenophobia existed before this referendum, but it feels like racists now think it is open season to attack people of a different nationality, accent or skin colour.
“When politicians fuel racist thinking, we should not be wholly surprised when some people feel they have been given a license to act on their prejudices.
“Society must not stand idly by while migrants and people from minority ethnic communities feel fearful for their safety and their future.
“Amnesty calls on Northern Ireland’s political representatives, in councils and in the Assembly, to do all in their power to stand against hate.”