Thousands of young activists converged this week for a Youth4Climate event in Milan, where Draghi and his UK counterpart Boris Johnson are also scheduled to take part on Thursday along with COP26 president Alok Sharma and U.N. chief Antonio Guterres.
Thunberg, 18, who on Tuesday lambasted world leaders for "30 years of blah, blah, blah" on battling climate change, is due to present Draghi and other climate leaders with the youth's slate of proposals for inclusion in the COP26 agenda.
She was joined in the meeting with Draghi by Ugandan activist Vanessa Nakate and Italian activist Martina Comparelli.
The trio and other activists held a news conference after their meeting with Draghi.
Italy is co-hosting the COP26 along with the UK from Oct. 31 to Nov. 12 in Glasgow.
The conference aims to secure more ambitious climate action from the nearly 200 countries that signed the 2015 Paris Agreement and agreed to try to limit human-caused global warming to 1.5 degrees Celsius.