Tehran has meanwhile been lobbying hard against the resolution and its Western backers.
“With a long history of colonialism and violation of human rights of other nations, the US and Europe are not in a position to pretend to be an advocate of human rights,” the Iranian foreign ministry tweeted Wednesday.
Foreign Minister Hossein Amir-Abdollahian recently tweeted at Baerbock that his country’s response to Germany’s “provocative, interventionist and undiplomatic stances” would be “proportionate and firm”.
Germany and Iceland received broad backing for their request to hold Thursday’s session, including from more than a third of the council’s 47 members.
Western diplomats voiced cautious optimism that the resolution would go through, but German foreign ministry spokesman Christofer Burger acknowledged to reporters that “success in obtaining a majority is not certain”.
The Human Rights Council has seen growing pushback from countries including China, Russia and Iran against often Western-led efforts to hold individual states accountable for alleged violations.
Last month, Western nations suffered a crushing defeat when their attempt to get China’s alleged abuses in its Xinjiang region onto the council agenda was thwarted.
But Iran may have a harder time blocking Thursday’s resolution.
The council has already voiced concerns at Iran’s human rights record by in 2011 appointing a so-called special rapporteur to monitor the country, and voting each year since then to renew that mandate.
“It should pass,” said Omid Memarian, an analyst at Democracy for the Arab World Now.
If it does, he told AFP, it will provide “a huge moral boost” to the protesters, and send a warning to rights violators in Iran that “the rest of the world will not be safe for them”.