According to police, around 80,000 people were on hand when the demonstration started at the Victory Column in central Berlin on Saturday, Reuters reports.
Several protesters had traveled far and arrived already during the night and early morning.
One of them is Arian Shadmani from Malmö.
- It feels historic and powerful and I am so happy that so many people have come here and support, she tells SVT's reporter Maria Petersson on location in Berlin.
Hope for change
The initiator of the demonstration is the non-profit organization Woman*-Life-Freedom Collective.
According to the organization, the train of people who marched during the afternoon in solidarity with the protests in Iran stretched over four kilometers.
Participants held up Iranian flags and signs criticizing Iran's leaders, many with the slogan "Women, Life, Freedom" in both English and German.
- This is what you should tell your children in the future.
Hopefully we will change something and then people will be able to say that we were part of this demonstration, or the revolution, says Arian Shadmani.
"Proud and moved"
Mitra Pooyandeh has also traveled from Sweden to participate in the provosts in Berlin.
She is touched that so many made it to the site to show their support for those protesting in their home country.
- When I saw the sea of all the people, I was so proud and moved.
To see all people demonstrating their solidarity with the people of Iran, she tells SVT.
The background to the protests is the death of the 22-year-old woman Masha Amini.
In mid-September, she was arrested by the Iranian morality police because her headscarf did not sufficiently cover her hair.
She later died in the hospital.
So far, more than 240 people have been killed and thousands arrested in the protests in many parts of the country, according to human rights activists.