The Jordanian Armed Forces (JAF) (Arabic: القوات المسلحة الأردنية, romanized: Al-Qūwāt Al-Musallaḥah Al-Urduniyya), also referred to as the Arab Army (Arabic: الجيش العربي, Al-Jaysh Al-ʿArabi), are the military forces of the Hashemite Kingdom of Jordan. They consist of the ground forces, air force, and navy. They are under the direct control of the King of Jordan who is the Supreme Commander of the Jordanian Armed Forces and acts by recommendation of the Defence Minister. The current Chairman of the Joint Chiefs of Staff is Major General Yousef Huneiti, who is also the King's military adviser.

The first organized army in Jordan was established on 22 October 1920, and was named the "Mobile Force". At the time it only had 150 men in its ranks. On its third anniversary in 1923, the force was renamed the Arab Legion, consisting of 1,000 men. By the time Jordan became an independent state in 1946, the Arab Legion numbered some 8,000 soldiers in 3 mechanized regiments. In 1956, King Hussein dismissed all British generals and changed the name of the Legion into the "Jordanian Arab Army" in what became known as the Arabization of the Jordanian Army command.

The army fought in several wars and battles, mostly against Israel. In the 1948 Arab–Israeli War, the capture of the West Bank by Jordan and the decisive Battles of Latrun, proved that the Arab Legion was the most effective army during the war. Several confrontations followed with Israel, resulting in mixed success; they included the Retribution operations, the Six-Day War, the War of Attrition and Yom Kippur War. Jordan also had to face the PLO and the Syrian Army during the events of Black September. The signing of the Israel–Jordan peace treaty in 1994 ended the state of belligerency between the two countries.

It is today considered to be among the most professional in the region, and is seen as particularly well-trained, organized, and equipped.

The first organized army in Jordan was established on 22 October 1920, and was named the "Mobile Force", at the time it was 150 man strong under the command of the British Captain Frederick Peake. On its third anniversary, in October 1923, the now-1,000-man force was renamed the Arab Legion.

In 1939, John Bagot Glubb, better known as Glubb Pasha, became the Legion's commander, and continued in office until the dismissal of British officers in March 1956. On 1 April 1926, the Transjordan Frontier Force was formed, consisting of only 150 men and most of them were stationed along Transjordan's roads.

In 1956, the Arabization of the Jordanian Army command (Arabic: تعريب قيادة الجيش العربي‎, Ta'reeb Qiyadat Al-Jaysh Al-Arabi) saw the dismissal of senior British officers commanding the Arab Legion by King Hussein and the subsequent renaming of the Legion into the Jordanian Armed Forces. Glubb Pasha, the Arab Legion's British commander, was replaced with Major General Radi Annab, who became the first Arab commander of the Arab Legion. Hussein's intentions to Arabize the Army command were to replace British officers with Jordanian officers, assert political independence from Britain, and improve relations with neighboring Arab states that viewed the British with suspicion. An annual celebration is held on 1 March in Jordan to mark the historic event.

Timeline of the history and development of the Jordanian Army and the Arab Legion: