Agha Muhammad Yahya Khan (4 February 1917 – 10 August 1980) was a Pakistani general who served as the third president of Pakistan from 1969 to 1971, under martial law. His presidency oversaw a civil war in East Pakistan, resulting in Bangladesh's secession. He also served as the fifth commander-in-chief of the Pakistan Army from 1966 to 1971.

A Pathan of Punjab, Khan was commissioned into the British Indian Army in 1939 and fought in the Second World War in the Mediterranean theatre. Following the Partition of British India, he joined the Pakistan Army and organized the Staff College, Quetta. In 1965, he played a vital role in executing Operation Grand Slam in Indian-administered Kashmir during the Second India–Pakistan War and was assigned to assume the army command in October 1966 by President Ayub Khan. In the wake of the 1968–1969 Pakistani protests, Ayub Khan resigned and transferred his authority to Yahya Khan.

Khan's presidency oversaw martial law by suspending the constitution in 1969. Holding the country's first general election in 1970, he barred power transition to the victorious Sheikh Mujibur Rahman from East Pakistan, leading to mass protests in the provincial wing and a call for sovereignty. On 25 March 1971, Khan ordered Operation Searchlight in an effort to suppress Bengali nationalism, which led to the Bangladesh Liberation War. Khan is considered a chief architect of the Bangladesh genocide along with his deputies Hamid Khan and Tikka Khan. In December 1971, Pakistan carried out unsuccessful pre-emptive strikes against the Bengali-allied Indian Army, culminating in the start of the Third India–Pakistan War. The wars resulted in the surrender of Pakistani forces and East Pakistan succeeded as Bangladesh, after which Yahya Khan resigned from the army command and transferred the presidency to Zulfikar Ali Bhutto. Khan remained under house surveillance prior to 1979 when he was released by Fazle Haq. Khan died the following year in Rawalpindi and was buried in Peshawar.

Khan's short regime is widely seen as a key factor in the breakup of Pakistan. His refusal to transfer power to the Awami League, despite their electoral victory in East Pakistan, led to political turmoil. This culminated in Operation Searchlight, a brutal military crackdown that resulted in the Bengali genocide, causing widespread death and displacement. Khan is viewed negatively in both Bangladesh, where he is seen as the architect of the genocide, and Pakistan, where his failure to prevent the country's disintegration is considered a national tragedy.

Agha Muhammad Yahya Khan was born on 4 February 1917 in the town of Chakwal, Punjab, British India. His family were written to be of Pashtun as well as Qizilbash origin and were descended from the elite soldiers of Iranian conqueror Nader Shah (r. 1736–1747). Yahya Khan also spoke Persian.

Few Pakistanis knew anything about Yahya Khan when he was vaulted into the presidency two years ago. The stocky, bushy–browed Pathan had been the army chief of staff since 1966... Yahya (pronounced Ya-hee-uh) Khan claims direct descent from warrior nobles who fought in the elite armies of Nader Shah, the Persian adventurer who conquered Delhi in the 18th century.

— Editorial, Time, 2 August 1971

According to Indian journalist Dewan Barindranath's book Private Life of Yahya Khan (published in 1974), Yahya's father, Saadat Ali Khan, worked in the Indian Imperial Police, in the Punjab province. He joined as a head constable and retired as a deputy superintendent. He was posted in Chakwal when Yahya Khan was born. Saadat was rewarded with the title of Khan Sahib for having disposed of the bodies of many independence activists, including Bhagat Singh, as they were executed in secrecy and the colonial authorities wanted to dispose of the corpses without attracting much attention, operations Saadat Ali Khan carried out "efficiently and faithfully."