Lebanon is a parliamentary, democratic republic, which implements a special system known as confessionalism.This system, allegedly meant to insure that sectarian conflict is kept at bay, attempts to fairly represent the demographic distribution of religious sects in the governing body.[ As such, high-ranking offices in the government are reserved for members of specific religious groups. The President, for example, has to be a Maronite Catholic Christian, the Speaker of the Parliament a Shi’a Muslim, the Prime Minister a Sunni Muslim and the Deputy Prime Minister an Orthodox Christian.

This trend continues in the distribution of the 128 parliamentary seats, which are divided equally between Muslims and Christians. Prior to 1990, the ratio stood at 6:5 in favor of Christians; however, the Taif Accord, which put an end to the 1975-1990 civil war, adjusted the ratio to grant equal representation to followers of the two religions. According to the constitution, direct elections must be held for the parliament every four years, although for much of Lebanon’s recent history, civil war precluded the exercise of this right.

The parliament elects the president for a non-renewable six-year term. At the urging of the Syrian government, this constitutional rule has been bypassed by ad hoc amendment twice in recent history. Elias Hrawi’s term, which was due to end in 1995, was extended for three years. This procedure, denounced by pro-democracy campaigners, was repeated in 2004 to allow Émile Lahoud to remain in office until 2007.

The President appoints the Prime Minister on the nomination of the parliament (which is, in most cases, binding). Following consultations with the parliament and the President, the Prime Minister forms the Cabinet, which must also adhere to the sectarian distribution set out by confessionalism.

Lebanon's judicial system is based on the Napoleonic Code. Juries are not used in trials. The Lebanese court system consists of three levels: courts of first instance, courts of appeal, and the court of cassation. There also is a system of religious courts having jurisdiction over personal status matters within their own communities, with rules on matters such as marriage, divorce, and inheritance. Lebanese law does not provide for Civil marriage (although it recognizes such marriages contracted abroad); efforts by former President Elias Hrawi to legalize civil marriage in the late 1990s floundered on objections mostly from Muslim clerics. Additionally, Lebanon has a system of military courts that also has jurisdiction over civilians for crimes of espionage, treason, and other crimes that are considered to be security-related. These military courts have been criticized by human rights organizations such as Amnesty International for "seriously fall[ing] short of international standards for fair trial" and having "very wide jurisdiction over civilians".

After Rafic Hariri's assassination on 14 February 2005, the country has seen turbulent political times, and it shaped the Cedar Revolution and the rise of the March 14 alliance which is made of: Lebanese Forces, Future Movement and the PSP.