The travel advisory by the External Affairs Ministry comes in the backdrop of police strike in some Brazilian states and the consequent law-and-order situation.
According to some media reports, more than 100 people have been killed during the strike.
As a matter of abundant precaution, it is an advice to Indian citizens travelling to Rio de Janerio to be alert, a ministry source said, adding the ministry will monitor the situation and advise further as required.
"Indian citizens visiting Rio de Janerio, Brazil are requested to monitor local media and follow the guidance of local authorities. In case they need consular assistance, they are requested to contact the Embassy of India in Brasilia at +55-61-32484006," the MEA travel advisory said.