Just before the gathering got underway, US Secretary of State Rex Tillerson expressed America's backing for Lebanon's "sovereignty, stability and independence," while French President Emmanuel Macron called on Mideast countries to refrain from interfering in Lebanese domestic affairs.
Lebanon has in recent years attracted considerable attention as world nations sought to keep the tiny Mediterranean country stable amid a Mideast region swirling in wars and conflict.
"The stability of Lebanon necessarily depends on its capacity to cope with the economic and social challenges stemming essentially from the Syria crisis," Prime Minister Saad Hariri said in opening remarks at the summit in Paris.
He called for investment in Lebanon, support for its security services, and a resolution to the refugee question that has dominated domestic politics since 2012.
More From This Section
It is the first major gathering of key nations to discuss Lebanon's future since a crisis erupted following Hariri's shock resignation last month while in Saudi Arabia.
Hariri, who is backed by Saudi Arabia, threw Lebanon into turmoil with his resignation and renewed a vigorous debate over foreign interference in Lebanese internal politics.
Lebanon's political parties depend on considerable support from regional powers for funds, security, and influence.
Hariri officially rescinded his resignation this week, saying Lebanon's political parties had reached an agreement to distance the country from regional conflicts, such as the war next door in Syria.
While the crisis was unfolding, French President Emmanuel Macron led diplomatic efforts to restore Hariri to his post and convince him to stay on as prime minister. The United States expressed support, recognising Hariri as one of its chief partners in the Middle East.
Hariri said Lebanon was able to weather its crisis thanks to its international partners and that the country's many parties affirmed their "commitment to dissociation from regional conflicts."
Macron said the international community would have to "stay mobilized" for Lebanon's peaceful future. He said that support is the "best rampart against instability" and that the world must do more to support security, but also to provide humanitarian and economic support.
After brief opening statements to the media, the dignitaries retreated to an ornate, gold-trimmed room for discussions. Prime Minister Saad Hariri shook hands with US Secretary of State Rex Tillerson as reporters were allowed in briefly for the start of the meeting.
US State Department spokeswoman Heather Nauert said Tillerson would affirm US support for Lebanon's military. She said he would also encourage other nations to do more to constrain Hezbollah and argue that doing so will lead to a "stronger, more stable Lebanon.