More than three decades after Gemayel was killed in a powerful explosion in Beirut, the case still sharply divides Lebanese, some see him as a national hero while others say he was an Israeli agent.
The assassination came at the height of the country's 15 -year civil war and Israel's invasion of Lebanon.
According to judicial officials, who spoke on condition of anonymity in line with regulations, Habib Tanious Shartouni and Nabil Faraj al-Alam, both members of the pro-Syrian Syrian Social Nationalist Party, were sentenced to death.
Gemayel, 34 at the time, was allied with Israel. His death prompted the Israeli army to storm and occupy Muslim west Beirut and Gemayel's right-wing Phalange militiamen to break into the Palestinian refugee camps of Sabra and Shatila on the outskirts of Beirut, killing hundreds of unarmed Palestinian refugees and Lebanese Muslims.
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"Today, Bashir and the September 14 martyrs, regained some of their rights because the loss of Bashir and his comrades cannot be compensated," Gemayel's wife, Solange, told reporters outside the courthouse shortly after the verdict was read.
Near the courthouse, SSNP supporters protested the verdict, saying that Shartouni, one of the two sentenced to death, should be honored for fighting "Israel's project in Lebanon."
Days after Gemayel was assassinated, Shartouni was detained and held until 1990, when he was set free after the Syrian military moved into Lebanon's Christian heartland and removed then-prime minister Michel Aoun from areas he controlled in east Beirut. Aoun is today the Lebanese president.
Shartouni has been at large since he broke out of prison on October 16, 1990. Though his whereabouts remain unknown, some local media have quoted him in interviews as saying he killed Gemayel and that at some point he lived in Syria.
Al-Alam, who allegedly instigated Shartouni to carry out the bombing, is believed to have died in Latin America in 2014 but Lebanese authorities have tried him in absentia, saying they have no evidence he is dead.
After Lebanon's civil war ended in 1990, a general amnesty was issued for all crimes except for those that were referred to the Supreme Judicial Council, which handles political and state security crimes.