Khan Abdul Ghaffar Khan (6 February 1890 – 20 January 1988), also known as Bacha Khan, was a Pakistani politician and anti-colonial activist from the North-West Frontier Province. He was the founder and leader of the non-violent Khudai Khidmatgar resistance movement and played a significant role in the Indian independence movement against British rule.

He was a political and spiritual leader known for his nonviolent opposition and lifelong pacifism; he was a secular Muslim and an advocate for Hindu–Muslim unity in the subcontinent. Because of his similar ideology and close friendship with Mahatma Gandhi, Khan was nicknamed Sarhadi Gandhi ("Frontier Gandhi") In 1929, Khan founded the Khudai Khidmatgar, an anti-colonial nonviolent resistance movement. The Khudai Khidmatgar's success and popularity eventually prompted the colonial government to launch numerous crackdowns against Khan and his supporters; the Khudai Khidmatgar experienced some of the most severe repression of the entire Indian independence movement.

Khan strongly opposed the proposal for the partition of India into the Muslim-majority Dominion of Pakistan and the Hindu-majority Dominion of India, and consequently sided with the pro-union Indian National Congress and All-India Azad Muslim Conference against the pro-partition All-India Muslim League. When the Indian National Congress reluctantly declared its acceptance of the partition plan without consulting the Khudai Khidmatgar leaders, he felt deeply betrayed, telling the Congress leaders "you have thrown us to the wolves." In June 1947, Khan and other Khudai Khidmatgar leaders formally issued the Bannu Resolution to the British authorities, demanding that the ethnic Pashtuns be given a choice to have an independent state of Pashtunistan, which was to comprise all of the Pashtun territories of British India and not be included (as almost all other Muslim-majority provinces were) within the state of Pakistan—the creation of which was still underway at the time. However, the British government refused the demands of this resolution. In response, Khan and his elder brother, Abdul Jabbar Khan, boycotted the 1947 North-West Frontier Province referendum on whether the province should be merged with India or Pakistan, objecting that it did not offer options for the Pashtun-majority province to become independent.

After the partition of India by the British government, Khan pledged allegiance to the newly created nation of Pakistan, and stayed in the now-Pakistani North-West Frontier Province; he was frequently arrested by the Pakistani government between 1948 and 1954. In 1956, he was again arrested for his opposition to the One Unit program, under which the government announced its plan to merge all the provinces of West Pakistan into a single unit to match the political structure of erstwhile East Pakistan (present-day Bangladesh). Khan was jailed or in exile during some years of the 1960s and 1970s. He was awarded Bharat Ratna, India's highest civilian award, by the Indian government in 1987.

Following his will upon his death in Peshawar in 1988, he was buried at his house in Jalalabad, Afghanistan. Tens of thousands of mourners attended his funeral including Afghan President Mohammad Najibullah, marching through the Khyber Pass from Peshawar towards Jalalabad. It was marred by two bomb explosions that killed 15 people; despite the heavy fighting at the time due to the Soviet–Afghan War, both sides, namely the Soviet–Afghan government coalition and the Afghan mujahideen, declared an immediate ceasefire to allow Khan's burial. He was given military honours by the Afghan government.

Abdul Ghaffar Khan was born on 6 February 1890 into a prosperous Sunni Muslim Muhammadzai Pashtun family from Utmanzai, Hashtnagar; they lived by the Jindee-a, a branch of the Swat River, in what was then British India's Punjab province. His father, Abdul Bahram Khan, was a land owner in Hashtnagar. Khan was the second son of Bahram to attend the British-run Edward's Mission School, which was the only fully-functioning school in the region and which was administered by Christian missionaries. At school, Khan did well in his studies, and was inspired by his mentor, Reverend Wigram, into seeing the crucial role education played in service to the local community. In his tenth and final year of secondary school, he was offered a highly prestigious commission in the Corps of Guides regiment of the British Indian Army. Khan declined due to his observational feelings that even Guides' Indian officers were still second-class citizens in their own nation. He subsequently followed through with his initial desire to attend university, and Reverend Wigram (Khan's teacher) offered him the opportunity to follow his brother, Abdul Jabbar Khan, to study in London, England. After graduating from Aligarh Muslim University, Khan eventually received permission from his father to travel to London. However, his mother wasn't willing to let another son go to London, so he began working on his father's lands in the process of figuring out his next steps.

At the age of 20 in 1910, Khan opened a madrasa in his hometown of Utmanzai. In 1911, he joined the independence movement of the Pashtun activist Haji Sahib of Turangzai. By 1915, the British colonial authorities had shut down Khan's madrasa, deeming its pro-Indian independence activism to be a threat to their authority. Having witnessed the repeated failure of Indian revolts against British rule, Khan decided that social activism and reform would be more beneficial for the ethnic Pashtuns. This led to the formation of the Anjuman-e Islāh-e Afghānia (Pashto: انجمن اصلاح افاغنه, 'Afghan Reform Society') in 1921, and the youth movement Pax̌tūn Jirga (پښتون جرګه, 'Pashtun Assembly') in 1927. After Khan's return from the Islamic Hajj pilgrimage to Mecca, Hejaz−Nejd (present-day Saudi Arabia) in May 1928, he founded the Pashto-language monthly political journal Pax̌tūn (پښتون, 'Pashtun'). Finally, in November 1929, Khan founded the Khudāyī Khidmatgār (خدايي خدمتګار, 'Servants of God') movement, which would strongly advocate for the end of British colonial rule and establishment of a unified and independent India.

In response to his inability to continue his own education, Bacha Khan turned to helping others start theirs. Like many such regions of the world, the strategic importance of the newly formed North-West Frontier Province (now Khyber Pakhtunkhwa, Pakistan), as a buffer for the British Raj from Russian influence was of little benefit to its residents. Opposition to British colonial rule, the authority of the mullahs, and an ancient culture of violence and vendetta prompted Bacha Khan to want to serve and uplift his fellow men and women by means of education. At 20 years of age, Bacha Khan opened his first school in Utmanzai. It was an instant success and he was soon invited into a larger circle of progressively minded reformers. He opened a series of "Azad" schools which were open to all, including girls. Many of these schools were shut down by British colonial authorities, who feared that revolutionary ideas might spread among the Pakhtuns through education. This was also rooted in their colonial belief that the Pakhtuns of the frontiers did not need education and should remain confined to a simple, traditional way of life.