Several demonstrations in support of Syria's Kurds have taken place in the Lebanese capital and across the world since Ankara launched its operation last month.
The demonstrators, some of them refugees and others members of Lebanon's long-established Kurdish community, held their protest near the U.S. embassy on the outskirts of Beirut.
They described feeling abandoned by Washington.
A Kurdish woman said "we the Kurdish community in Lebanon refuse and protest the Turkish operation against Afrin. We are protesting outside the U.S. embassy to tell the American people we Kurds are peaceful people."
Turkey has carried out air strikes and used its Syrian rebel allies to attack the Kurdish People's Protection Units (YPG), a group Ankara considers a terrorist organization linked to the Kurdish insurgency active on its own soil.
Several of the protesters at the demonstration, which passed without any incident, were carrying olive branches and waving YPG posters.
Some of them also held portraits of a Kurdish female combattant, Barin Kobani, whose corpse appeared in a shocking video last week.
Her family and Kurdish officials have accused Turkish-backed rebels of "defiling" her body.