A military court sentenced the two Syrian nationals, George and Michel Tanlian, to death, the National News Agency reported on Monday.
The two suspects, part of a gang of five brothers, were accused of killing a Lebanese army officer.
Last year, the Lebanese security forces arrested the five suspects which were identified by Interior Minister Marwan Charbel as Michel, Georges, Aziz, Moussa and Maurice Tanlian. The minister said that they were of Syrian descent, adding that Aziz, Moussa and Maurice gained Lebanese nationality.
The suspects are accused of the murder of 11 people, most of them taxi drivers.