Reuters news Agency reported that She will speak through video link at the invitation of present member Estonia.
Two Moscow-based AP journalists covering the protests in Belarus were deported to Russia on Saturday, part of a crackdown on the media. Many Belarusian journalists also had their media accreditation revoked, including the AP's Belarusian journalists. https://t.co/CJ0jrKRSpO
— The Associated Press (@AP) August 29, 2020
Ms Tikhanovskaya Belarus was after losing to veteran leader Alexander Lukashenko in this month’s disputed Presidential election.
Pro-democracy campaigners have vowed to force Mr Lukashenko from office.
They say they will come out on the streets every week until he leaves.
Tens of thousands on Sunday occupied the centre of the capital Minsk for the third week in a row to protest about his victory, and dozens were detained there and in other cities. At least four people have died and hundreds have been injured in the unrest this month.
Estonia, Lithuania and Latvia are to announce travel sanctions on about 30 Belarusian officials including Mr Lukashenko on Monday, Reuters news agency reports.
Mr Lukashenko has led the former Soviet republic of Belarus since 1994, maintaining close relations with neighbouring Russia, on which the country relies heavily for energy supplies and trade.
Ms Tikhanovskaya’s press team announced both plans for a speech to the UN Security Council on 4 September and an address to the Parliamentary Assembly of the Council of Europe on 8 September.
Russia, President Lukashenko’s chief backer, is a permanent member of the UN Security Council, and it is unclear if it will try to stop the Belarusian politician speaking.
Last Monday, Ms Tikhanovskaya told the European Parliament’s Foreign Affairs Committee that government intimidation could not stop the protesters. “We will not relent,” she said, speaking from the Lithuanian capital Vilnius. “We demand to respect our basic rights. We demand all political prisoners be free.”
Since moving to Lithuania, the opposition leader has called on Belarusians to continue to demonstrate peacefully against Mr Lukashenko.
Belarus: Journalists covering protests stripped of accreditation
Two journalists with the BBC’s Russian service are among those affected.
In a statement, the BBC said it condemned “in the strongest possible terms this stifling of independent journalism”.
Fresh demonstrations against the government broke out on Saturday.
Belarus is gripped by mass protests, triggered by an election widely believed to have been rigged in favour of the long-time leader Alexander Lukashenko.
The BBC has urged the Belarusian authorities to allow access to its reporters.
We believe it is vital for the people of Belarus to have access to impartial, independent information about events in their country. BBC Russian, which reaches more than five million people a week, has been a major source of news for people in Belarus and Russia during the post-election unrest,” it said.