The protesters, some wrapped in the red, blue and orange flags of Armenia and the contested enclave, marched from the Azerbaijan embassy to the Turkish embassy, demanding peace.
The disputed territory is an ethnic Armenian enclave in Azerbaijan, home to about 150,000 people, which broke from Azerbaijan’s control in a war in the 1990s that killed about 30,000 people.
Recent fighting, since September 27, has been the heaviest in two decades, with more than 450 people reported dead, thousands forced to flee their homes and fears of escalation into a devastating all-out conflict.
The march attracted a mostly young crowd. They gathered in front of the embassy of Turkey, which has been accused of military support for Azerbaijan in the conflict. Ankara denies the charge.
Argentina’s Armenian community is estimated at 100,000 people, most of whom are third- or fourth-generation.