The National Liberation Front (NLF; Arabic: الجبهة القومية للتحرير, romanized: al-jabhat al-qawmiyya lil-taḥrīr) was a Marxist–Leninist paramilitary organization and a political party operating in the Federation of South Arabia, (now southern Yemen) during the Aden Emergency.

Following the exit of the British armed forces, the NLF seized power from its rival, the Arab nationalist Front for the Liberation of Occupied South Yemen (FLOSY).

In the aftermath of the Emergency, the NLF renamed itself the National Front and eventually became the main force behind the creation of the Yemeni Socialist Party, which subsequently governed the country as a single-party Marxist–Leninist state.

They attempted to grant independence to the Federation of South Arabia by giving Abdullah al Asnag's FLOSY control of the country.

[3] In January 1967, there were mass riots by NLF and FLOSY supporters in the old Arab quarter of Aden town, which continued until mid February, despite the intervention of British troops.

[5] Order was restored by the British, mainly due to the efforts of the 1st Battalion Argyll and Sutherland Highlanders, under the command of Lt-Col. Colin Campbell Mitchell.

When the last governor of Aden, Sir Humphrey Trevelyan, left the country he had no one to give the keys to but as a point of respect had the government house repainted for whoever emerged victorious.

After the civil war in 1970, Saudi Arabia recognized the Yemen Arab Republic and a ceasefire against remaining belligerents was put in place.