Citizens from Australia, Canada, Japan and the United States will not need visas to enter Brazil during this year's Olympic and Paralympic Games, the Government has announced.

The exemption made for the citizens of these countries will last from June 1 to September 18 and will see them granted 90-day visas.

The law authorising the temporary exemption from visas was approved by President Dilma Rousseff in November, although the beneficiary countries had not been confirmed until now.

Now, visitors with or without Olympic tickets can enter Brazil with just their passport, or other official documentation.

These criteria were adopted for countries with a strong Olympic tradition, which have organised Olympics in the past, who offer no migration risks and pose no threats to national security, according to the Government's official Gazette.

The citizens of numerous other countries, including those from the European Union, Russia, Mexico, Argentina, and South Korea can already enter the country for up to 90 days without a visa.

The Olympic Games are due take place from August 5 until 21 with the Paralympic Games to follow from September 7 until 18.

According to the Ministry of Tourism, Brazil hopes the Games will help to increase by 20 per cent the number of tourists expected between January and September 2016.

A rise in tourism could give a much-needed boost to Brazil's economy, which is currently suffering a deep recession.