Internal conflict in Yemen may refer to:

• Al Qaeda insurgency in Yemen
• Shia insurgency in Yemen
• South Yemen insurgency

The al Qaeda insurgency in Yemen refers to the armed conflict between the Yemeni government with U S assistance, and al Qaeda affiliated cells. The strife is often categorized as a sub conflict in the greater Global War on Terror.

Government crackdown against al Qaeda cells began in 2001, and reached an escalation point on January 14, 2010, whenYemen declared open war on al Qaeda. In addition to battling al Qaeda across several provinces, Yemen is also contending with Shia insurgency in the north and militant separatists in the south. Fighting with al-Qaeda escalated during the course of the 2011 Yemeni revolution, with Jihadists seizing most of the Abyan Governorate and declaring it an Emirate at the close of March. A second wave of violence occurred throughout early 2012, with militants claiming territory across the southwest amid heavy combat with government forces.

In May 2013, attackers blew up Yemen's main oil pipeline, halting the flow of crude oil.

On 18 March 2015, the conflict escalated into a full scale civil war.

The Houthi insurgency in Yemen, also known as the Houthi rebellion,  is an ongoing sectarian military rebellion pitting Zaidi Shia Houthis against the Yemeni military that began inNorthern Yemen and has since escalated into a full scale civil war. It began in June 2004, when dissident cleric Hussein Badreddin al Houthi, a leader of the Zaidi sect, launched an uprising against the Yemeni government. Initially, most of the fighting took place in northwestern Yemen, but some of the fighting spread to neighbouring governorates  and the Saudi province of Jizan. Since 2014 the nature of the insurgency has changed with the Houthi takeover in Yemen and then into the ongoing Civil War with a major Saudi led intervention in Yemen beginning in 2015.

General Ali Mohsen al Ahmar commanded the Yemeni security forces during the conflict and led all the government offensives from 2004 until 2011, when he resigned his post to defend protesters during the Yemeni Revolution.

The rebels attacked the presidents residence and swept into the presidential palace. President Abed Rabbo Mansour Hadi was inside the residence as it came under heavy shelling for half an hour, but he was unharmed and protected by guards, according to Information Minister Nadia al Sakkaf. Presidential guards surrendered the residence after being assured that Hadi could safely evacuate. The U.N. Security Council called an emergency meeting about the unfolding events. United Nations Secretary General Ban Ki Moon expressed concern over the deteriorating situation in Yemen and urged all sides to cease hostilities. On 22 January, President Abed Rabbo Mansour Hadi and Prime Minister Khaled Bahah tendered their resignations to parliament, which reportedly refused to accept them.

The South Yemen insurgency is a term used by the Yemeni government to describe the protests and attacks on government forces in southern Yemen, ongoing since 27 April 2009, on South Yemens independence day. Although the violence has been blamed on elements within the southern secessionist movement, leaders of the group maintain that their aims of independence are to be achieved through peaceful means, and claim that attacks are from ordinary citizens in response to the government's provocative actions. The insurgency comes amid the Shia insurgency in the countrys north as led by the Houthi communities. Southern leaders led a brief, unsuccessful secession in 1994 following unification. Many of them are involved in the present secession movement. Southern separatist insurgents are active mainly in the area of former South Yemen .