Bachir Gemayel (10 November 1947 – 14 September 1982) (first name also spelled Bashir and surname also spelled al-Jumayyil, El Gemaiel, Joomayyeel) (بشير الجميّل) was a Lebanese politician, militia commander, and president-elect. He was a senior member of the Phalange party and the commander of the Lebanese Forces militia amid the first several years of the Lebanese Civil War (1975–90). He was elected president on August 23, 1982 while the country was torn by civil war and occupied by both Israel and Syria. He was assassinated on September 14, 1982, along with 26 others, when a bomb exploded in the Beirut headquarters of the Phalange. The bomb was planted by Habib Tanious Shartouni. The FBI blamed the Syrian Social Nationalist Party.

Bachir was born on November 10, 1947 in the Achrafieh neighborhood of Beirut, the youngest of six children. The Gemayel family is originally from the Bikfaya village in the Matn District of Lebanon and is one of the most influential Christian families in Lebanon. His father was Pierre Gemayel, who founded the Phalange party in 1936 as a youth movement. The Phalange, a conservative party that though is officially secular, is supported mostly by Maronite Christians. Gemayel attended College de Notre Dame de Jamhour and the Institution Moderne du Liban (I.M.L) - Fanar. He completed his formal university education at St. Joseph University (Université Saint-Joseph - U.S.J.) in Beirut. After teaching for three years at the Lebanese Modern Institute, he graduated in 1971 with a degree in Law and another in Political Sciences in 1973. In 1971, Gemayel also took another law qualification from the American and International Law Academy in Dallas, Texas. Qualifying in 1972, he joined the bar association and opened an office in Hamra, West Beirut.