Pope Leo XIV arrived in Lebanon on Sunday on the second and final leg of his first overseas trip as leader of the Catholic Church.
The first US pope flew from Turkey, where he had been visiting for four days.
Hours before Leo's arrival, crowds gathered along the roads from the airport to the presidential palace, waving Lebanese and Vatican flags. He will meet the president and prime minister and make an address, only his second to a foreign government.
Lebanon has the largest share of Christians in the Middle East.
Leaders in Lebanon, which hosts 1 million Syrian and Palestinian refugees and is also struggling to recover from years of economic crisis, are concerned about how the ongoing armed conflict would exacerbate the issues that Beirut is facing.
Lebanon's diverse communities have also welcomed the papal trip, with leading Druze cleric Sheikh Sami Abi al-Muna saying Lebanon "needs the glimmer of hope represented by this visit."
Reinforcements from the Lebanese army and internal security forces were deployed to the airport before Leo's arrival.
His convoy will pass through Beirut's southern suburbs - an area where Hezbollah holds sway. The group's Imam Mehdi Scouts are to hold a welcoming ceremony by the roadside as the convoy passes.
Pope visiting five Lebanese cities, towns
Leo, a relative unknown on the world stage before becoming pope in May, is being closely watched as he makes his first speeches overseas and interacts for the first time with people outside mainly Catholic Italy.
On Saturday, Leo visited Istanbul's famed Blue Mosque, in his first visit as pope to a Muslim place of worship. He removed his shoes as a sign of respect but did not pray at the mosque as planned, which surprised Vatican officials.
The pope attended an Orthodox Christian liturgy on Sunday morning led by Istanbul-based Ecumenical Patriarch Bartholomew, spiritual leader of the world's 260 million Orthodox Christians.
In remarks during the service, which was filled with Greek chants, Bartholomew said the world "expects a unified message of hope from Christians unequivocally condemning war and violence."
"We cannot be complicit in the bloodshed taking place in Ukraine and other parts of the world," said the patriarch.
Leo, 70 and in good health, has a crowded itinerary in Lebanon, visiting five cities and towns from Sunday to Tuesday, when he returns to Rome.
His schedule includes a prayer at the site of a 2020 chemical explosion at the Beirut port that killed 200 people and caused billions of dollars' worth of damage.
He will also lead an outdoor Mass on the Beirut waterfront and visit a psychiatric hospital, one of the few mental health facilities in Lebanon, where carers and residents are eagerly anticipating his arrival.