This is the first time the human rights group has ever worked on the ground in the United States.
Amnesty International said it will be observing police and protestor activity and also plans to advise activists on non-violent protest methods.
Amnesty International USA's Executive Director Steven Hawkins said that the "people of Ferguson have the right to protest peacefully the lack of accountability for Michael Brown's shooting,'' according to the Independent.
Missouri Governor Jay Nixon signed an order to send the National Guard into Ferguson to "maintain peace and order."
An independent autopsy found Michael Brown, 18, was shot by a Ferguson police officer six times, including twice in the head.