Field Marshal Mohammad Ayub Khan (14 May 1907 – 19 April 1974) was a Pakistani army officer and military dictator who served as the second president of Pakistan from 1958 until his resignation in 1969. He was the first native commander-in-chief of the Pakistan Army, serving from 1951 to 1958. Ayub Khan's presidency started in 1958 when he overthrew President Iskander Mirza in a coup d'état, and ended in 1969 when he resigned amid mass protests and strikes across the country.

Born in the North-West Frontier Province, Ayub Khan was educated from the Aligarh Muslim University and trained at the Royal Military College, Sandhurst. He fought in the Second World War on the British side against the Imperial Japanese Army. After the Partition of British India in August 1947, he joined the Pakistan Army and was posted in East Bengal. In 1951, he became the first native commander-in-chief, succeeding General Gracey. From 1953 to 1958, he served in the civilian government as Defence and Home Minister and supported President Iskandar Ali Mirza's decision to impose martial law against prime minister Feroz Khan Noon's administration on 7 October 1958. Three weeks later, Ayub Khan seized the presidency in a military coup, the first in the country's history.

As president, Khan controversially appointed General Musa Khan to replace him as commander-in-chief, superseding decorated senior officers such as Generals Adam Khan, Sher Ali Khan Pataudi and M.A. Latif Khan. He aligned Pakistan with the United States, and allowed American access to air bases inside Pakistan, most notably the airbase outside of Peshawar, from which spy missions over the Soviet Union were launched. Relations with neighboring China were strengthened, but his alignment with the US worsened relations with the Soviet Union in 1962. He launched Operation Gibraltar against India in 1965, leading to an all-out war. It resulted in a stalemate, and peace was restored via the Tashkent Declaration. Domestically, Ayub subscribed to the laissez-faire policy of Western-aligned nations at the time. Khan privatised state-owned industries and liberalised the economy generally. Large inflows of foreign aid and investment led to the fastest-growing economy in South Asia. His tenure was also distinguished by the completion of hydroelectric stations, dams, and reservoirs. Under General Ayub Khan, Pakistan's space program was established, and the country launched its first uncrewed space mission by 1962. However, the failure of land reforms and a weak taxation system meant that most of this growth landed in the hands of the elite. In 1965, General Ayub Khan entered the presidential race as the Convention Muslim League's candidate to counter the opposition candidate Fatima Jinnah. Ayub Khan won the elections and was re-elected for a second term. In 1967, disapproval of price hikes of food prompted demonstrations across the country led by Zulfikar Ali Bhutto. Due to the Mass Uprising protests in East Pakistan, finding no way, frightened General Ayub Khan resigned on 25 March 1969 and appointed General Yahya Khan as his successor. Later, fighting a brief illness, he died in 1974.

Khan remains the country's longest-serving president and second-longest serving head of state. His legacy remains mixed; his era is often referred to as the "Decade of Development." Khan is credited with economic prosperity and industrialisation. He is denounced by critics for beginning the first of the intelligence agencies' incursions into national politics, for concentrating wealth in a corrupt few hands, and for geographically discriminatory policies that later led to the Bangladesh Liberation War.

Ayub Khan was born on 14 May 1907 in Rehana, a village in the Haripur district of the North-West Frontier Province of British India into a Hindko-speaking Hazarewal family of Pashtun descent, belonging to the Tareen tribe.

He was the first child of the second wife of Mir Dad Khan, a Risaldar-Major (an armoured corps JCO which was then known as VCO) in the 9th Hodson's Horse which was a cavalry regiment of the British Indian Army. For his basic education, he was enrolled in a school in Sarai Saleh, which was about 4 miles from his village. He used to go to school on a mule's back and was shifted to a school in Haripur, where he started living with his grandmother.

He went on to study at Aligarh Muslim University (AMU) and while pursuing his college education, he was accepted into the Royal Military College, Sandhurst on the recommendation of General Andrew Skeen; he trained first in India and then departed for Great Britain. Ayub Khan was fluent in Urdu, Pashto, English, and his native Hindko language.

Ayub Khan was admitted to the Royal Military College, Sandhurst, in 1926. He was commissioned as a second lieutenant on 2 February 1928 in the 1st Battalion of the 14th Punjab Regiment (better known as 1/14th Punjab Regiment) of the British Indian Army – before this he was attached to the Royal Fusiliers. Amongst those who passed out with him was Joyanto Nath Chaudhuri, who served as Chief of the Army Staff of India from 1962 to 1966 while Ayub was the president of Pakistan. After the standard probationary period of service in the British Army, he was appointed to the British Indian Army on 10 April 1929, joining the 1/14th Punjab Regiment Sherdils, now known as the 5th Punjab Regiment.