The Syrian occupation of Lebanon (Arabic: , French: Occupation syrienne du Liban) began in 1976, during the Lebanese Civil War, and ended in 30 April 2005 after the Cedar Revolution and several demonstrations in which most of the Lebanese people participated, and the withdrawal agreement was signed by President Bashar al-Assad and Saad Hariri, son of Rafic Hariri. All of these changes were a result the assassination of former Lebanese Prime Minister Rafic Hariri.

In January 1976, a Syrian proposal to restore the limits to the Palestinian guerrilla presence in Lebanon, which had been in place prior to the outbreak of the civil war, was welcomed by Maronites, but rejected by the Palestinian guerrillas.In October 1976, at a meeting of the Arab League, Syria accepted a ceasefire. The League ministers decided to expand an existing small Arab peacekeeping force in Lebanon, but it grew to be a large Arab Deterrent Force consisting almost entirely of Syrian troops. The Syrian military intervention was thus legitimized and received subsidies from the Arab League for its activities.In 1989, at the final accords of the civil war, two rival administrations were formed in Lebanon: a military one under Michel Aoun in East Beirut and a civilian one under Selim el-Hoss based in West Beirut; the latter gained the support of the Syrians. Aoun opposed the Syrian presence in Lebanon, citing the 1982 UN Security Council Resolution 520. In the resulting "War of Liberation", which erupted in March 1989, Aoun's forces were defeated and he himself exiled from Lebanon. In 1991, a Treaty of "Brotherhood, Cooperation, and Coordination", signed between Lebanon and Syria, legitimized the Syrian military presence in Lebanon. It stipulated that Lebanon would not be made a threat to Syria's security and that Syria was responsible for protecting Lebanon from external threats. In September that same year, a Defense and Security Pact was enacted between the two countries.With the consequent adoption of UN Security Council Resolution 1559 and following the assassination of the Lebanese ex-premier Rafic Hariri in 2005, and the alleged involvement of Syria in his death, a public uprising called the Cedar Revolution had swept the country. Syria completed its full withdrawal from Lebanon on 30 April 2005.

Syria (Arabic: سُورِيَا or سُورِيَة, Sūriyā), officially the Syrian Arab Republic (Arabic: ٱلْجُمْهُورِيَّةُ ٱلْعَرَبِيَّةُ ٱلسُّورِيَّةُ, romanized: al-Jumhūrīyah al-ʻArabīyah as-Sūrīyah), is a country in Western Asia. Syria borders the Mediterranean Sea to the west, Turkey to the north, Iraq to the east and southeast, Jordan to the south, and Israel and Lebanon to the southwest. Cyprus lies to the west across the Mediterranean Sea. A country of fertile plains, high mountains, and deserts, Syria is home to diverse ethnic and religious groups, including the majority Syrian Arabs, Kurds, Turkmens, Assyrians, Armenians, Circassians, Mandaeans, and Greeks. Religious groups include Sunnis, Christians, Alawites, Druze, Isma'ilis, Mandaeans, Shiites, Salafis, and Yazidis. The capital and largest city of Syria is Damascus. Arabs are the largest ethnic group, and Sunnis are the largest religious group.

Syria is a unitary republic consisting of 14 governorates and is the only country that politically espouses Ba'athism. It is a member of one international organization other than the United Nations, the Non-Aligned Movement; it was suspended from the Arab League in November 2011 and the Organisation of Islamic Cooperation, and self-suspended from the Union for the Mediterranean.The name "Syria" historically referred to a wider region, broadly synonymous with the Levant, and known in Arabic as al-Sham. The modern state encompasses the sites of several ancient kingdoms and empires, including the Eblan civilization of the 3rd millennium BC. Aleppo and the capital city Damascus are among the oldest continuously inhabited cities in the world. In the Islamic era, Damascus was the seat of the Umayyad Caliphate and a provincial capital of the Mamluk Sultanate in Egypt.

The modern Syrian state was established in the mid-20th century after centuries of Ottoman rule, and after a brief period as a French mandate, the newly created state represented the largest Arab state to emerge from the formerly Ottoman-ruled Syrian provinces. It gained de jure independence as a parliamentary republic on 24 October 1945, when the Republic of Syria became a founding member of the United Nations, an act which legally ended the former French Mandate, although French troops did not leave the country until April 1946.

The post-independence period was tumultuous, with many military coups and coup attempts shaking the country from 1949 to 1971. In 1958, Syria entered a brief union with Egypt called the United Arab Republic, which was terminated by the 1961 Syrian coup d'état. The republic was renamed as the Arab Republic of Syria in late 1961 after the December 1 constitutional referendum of that year, and was increasingly unstable until the 1963 Ba'athist coup d'état, since which the Ba'ath Party has maintained its power. Syria was under Emergency Law from 1963 to 2011, effectively suspending most constitutional protections for citizens.

Bashar al-Assad has been president since 2000 and was preceded by his father Hafez al-Assad, who was in office from 1971 to 2000. Throughout his rule, Syria and the ruling Ba'ath Party have been condemned and criticized for various human rights abuses, including frequent executions of citizens and political prisoners, and massive censorship. Since March 2011, Syria has been embroiled in a multi-sided civil war, with a number of countries in the region and beyond involved militarily or otherwise. As a result, a number of self-proclaimed political entities have emerged on Syrian territory, including the Syrian opposition, Rojava, Tahrir al-Sham and the Islamic State group. Syria was ranked last on the Global Peace Index from 2016 to 2018, making it the most violent country in the world due to the war. The conflict has killed more than 570,000 people, caused 7.6 million internally displaced people (July 2015 UNHCR estimate) and over 5 million refugees (July 2017 registered by UNHCR), making population assessment difficult in recent years.