The work of art consists of 13,250 of portraits from 190 countries around the world and carries the message: the eyes of the world are upon you, according to the promoters.
It was raised on Saturday in coordination with the organisers of an international film festival on human rights.
The flag was created by Geneva artist and activist, Dan Acher.
Geneva is the latest stage of a tour which began in 2019 in the Spanish capital, Madrid, which hosted a United Nations climate change conference.
The flag was also due to be hoisted in Paris and New York over the past two years, but the events had to be cancelled due to the Covid pandemic.
The western Swiss city is the seat of numerous international organisations and a European seat of the UN.
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