Syria will come under renewed pressure to end violence and human rights abuses against anti-government protestors.
Meeting in Tunisia, the “Friends of Syria” Contact Group will demand an immediate ceasefire and the establishment of a humanitarian corridor.
Western and Arab diplomats will discuss other measures including travel bans and asset freezes but no major breakthroughs are expected.
Russian and Chinese representatives are not taking part as Moscow and Beijing oppose foreign intervention.
Meanwhile, the former UN Secretary-General Kofi Annan has been made a joint special envoy to Syria by the United Nations and the Arab League.