This year's summit comes against a backdrop of ongoing wars in Syria and Yemen, rival authorities in Libya and a lingering boycott of Qatar by four fellow League members. Algeria's President Abdelaziz Bouteflika and Sudan's President Omar al-Bashir skipped the meeting as they contend with mass protests against their long reigns.
Representatives from the 22-member league - minus Syria - aim to jointly condemn President Donald Trump's recognition of Israeli control over the Golan Heights, which Israel seized from Syria in the 1967 war, and Trump's decision last year to recognize Jerusalem as Israel's capital.
One of the few things that have united the Arab League over the last 50 years is the rejection of Israel's presence in the Golan Heights as well as east Jerusalem and the West Bank.
The international community, including the United States, largely shared that position until Trump upended decades of US policy by moving the US Embassy to Jerusalem last year and recognizing Israel's annexation of the strategic Golan plateau earlier this month.
The Arab leaders meeting in Tunisia are expected to issue a statement condemning those moves but are unlikely to take any further action.
That's in part because regional powerhouses Saudi Arabia and the United Arab Emirates have cultivated close ties with the Trump administration, viewing it as a key ally against their main rival, Iran. Both are under pressure over their devastating three-year war with Yemen's Houthi rebels, and Riyadh is still grappling with the fallout from the killing of Washington Post columnist Jamal Khashoggi by Saudi agents last year.
Lebanon's Foreign Minister Gebran Bassil said Saturday that Arab ministers had voiced support in a preparatory meeting for a declaration that Trump's Golan move violates the UN Charter, which prohibits acquiring territories by force.
The Arab League is also considering readmitting Syria, a founding member that was expelled in the early days of the 2011 uprising against President Bashar Assad. But officials speaking ahead of the meeting said it was unlikely Syria would be welcomed back anytime soon.
The United Arab Emirates reopened its embassy in Damascus last year, and other Arab states have expressed support for restoring relations. But Saudi Arabia and Qatar have actively supported the rebels trying to overthrow Assad, and many other states view his government as an Iranian proxy that should continue to be shunned.
In a rare sign of easing tensions across another regional rift, Saudi Arabia's King Salman and Qatar's Emir Khalifa bin Hamad Al Thani sat at the same sprawling table when the heads of delegations met Sunday. It was the first time the two leaders have appeared in the same room since Saudi Arabia led the boycott of Qatar nearly two years ago over Doha's ties to Iran and its support for regional Islamist groups.