Syrian refugees in Lebanon and Jordan are being given the chance to vote early in the presidential election due to be held next week.
The main polling stations opened at the Syrian embassies in Beirut and Amman on Wednesday.
The UN says 2.8 million Syrian refugees have fled to neighbouring countries.
President Bashar al-Assad is widely expected to win a third seven-year term in office in the 3 June election, which has been branded a farce by the West.
More than 160,000 people have died since the uprising against President Assad began in March 2011.
Thousands of Syrians have been flocking to their embassy in the hills overlooking Beirut.
Source : bbc