Southern Lebanon (Arabic: جنوب, romanized: jnoub, lit. 'south') is the area of Lebanon comprising the South Governorate and the Nabatiye Governorate. The two entities were divided from the same province in the early 1990s. The Rashaya and Western Beqaa Districts, the southernmost districts of the Beqaa Governorate, in Southern Lebanon are sometimes included.

The main cities of the region are Sidon, Tyre, Jezzine and Nabatiyeh. The cazas of Bint Jbeil, Tyre, and Nabatieh in Southern Lebanon are known for their large Shi'a Muslim population with a minority of Christians. Sidon is predominantly Sunni, with the rest of the caza of Sidon having a Shi'a Muslim majority, with a considerable Christian minority, mainly Melkite Greek Catholics. The cazas of Jezzine and Marjeyoun have a Christian majority and also Shia Muslims. The villages of Ain Ebel, Debel, Qaouzah, and Rmaich are entirely Christian Maronite. The caza of Hasbaya has a Druze majority.