Ahl-i-Hadith or Ahl-e-Hadith (Urdu: اہلِ حدیث, people of hadith) is a Salafi reform movement that emerged in North India in the mid-nineteenth century from the teachings of Sayyid Ahmad Shahid, Syed Nazeer Husain and Nawab Siddiq Hasan Khan. It is an offshoot of the 19th-century Indian Tariqah-i-Muhammadiya movement led by Titumir and tied to the 18th-century traditions of Shah Waliullah Dehlawi and the Wahhabi movement. The adherents of the movement described themselves variously as "Muwahideen", "Ahl-us Sunnah wal Jamaah" and as "Ahl e-Hadith."

Initially coterminous with the so-called (Indian) "Wahhabis", the movement emerged as a distinct group around 1864, having claimed the appellation of "Ahl-i Hadith" to highlight its commitment to the body of ḥadīth—statements attributed to Muhammad, validated through chains of transmission—and its political quietism. The movement was noteworthy for its robust opposition to practices associated with the veneration of saints, which they regarded as a breach of the doctrine of Tawḥīd (Islamic monotheism). Its adherents profess to hold the same views as those of the early Ahl al-Hadith school. They reject taqlid (following legal precedent) and favour ijtihad (independent legal reasoning) based on the scriptures. Today, the terms "Salafi" and "Ahl-i Hadith" are often used interchangeably, the movement shares doctrinal tendencies with the Hanbali school prevalent in the Arabian Peninsula, and many of its members have identified themselves with the Zahiri school of thought. Some believe it possesses some notable distinctions from the mainly Arab Salafis.

Holding considerable influence amongst the urban Islamic intellectual circles of South Asia, the Ahl-i Hadith consolidated themselves into the All India Ahl-i-Hadith Conference in 1906 and, in Pakistan, formed a political wing in the Jamiat Ahle Hadith in 1986. The movement has drawn support and funding from Saudi Arabia.

Imam Shah Waliullah Dehlawi (1703 – 1762 C.E) is considered as the intellectual fore-forefather of the Ahl-i-Hadith. After his Pilgrimage to Mecca, Shah Waliullah Dehlawi spent 14 months in Medina, studying Qur'an, Hadith and works of the classical Hanbali theologian Ibn Taymiyya (d. 728 A.H/ 1328 C.E) under the hadith scholar Muhammad Tahir al-Kurani, the son of Ibrahim al-Kurani. Upon return to India, he preached Tawhid and a return to the Sunnah, and claimed Ijtihad just like Ibn Taymiyya. Shah maintained that Ijtihad is essential for Muslim scholars for all ages since cognizance of Divine injunctions related to the novel issues of each era is obligatory. He also opposed various rituals of saint veneration and customs at saint's tombs which he held to be idolatrous. Shah's campaigns against bid'ah (religious innovations), emphasis on Ijtihad as well as his political activities were immensely influenced by Ibn Taymiyya. His precepts for reviving an Islamic Caliphate modelled on the Khulafa al-Rashidun as elucidated in his treatises like Izalat al-Khifa, Qurrat al-'Aynayn, etc. echoed the doctrines propounded by Ibn Taymiyya during the 14th/7th century.

After the death of his father, Shah 'Abd al-Aziz continued the works of Shah Waliullah. He was a Muhaddith who emphasized the importance of Hadith with students all across the subcontinent. As a teacher, preacher and social religious-reformer, Shah 'Abd al-Aziz was closely monitoring the socio-political developments in the subcontinent. British were gaining ascendancy in India by capturing power in Bengal, Bihar and Orissa. In 1799, British defeated the Kingdom of Mysore in the Fourth Anglo-Mysore War. When the British armies entered Delhi in 1803, the Mughal Empire was turned into a protectorate of British East India Company, thus gaining political supremacy in the subcontinent. Upon this, Shah 'Abd al-Aziz declared a decisive fatwa declaring India to be Dar-al Harb (abode of war). This was the first significant fatwa against colonial rule in the subcontinent that gave an indirect call to South Asian Muslims to fight colonial occupation and liberate the country. This decisive fatwa by Shah Waliullah's eldest son and successor, Shah 'Abd al Azeez, calling upon Muslims to strive to restore India back to Islamic rule, would greatly inspire his student Sayyid Ahmed Shahid and motivate him to plan for future Jihad. After a brief period as a mercenary, Sayyid Ahmad would further pursue his religious studies and re-appeared as an eminent religious scholar and a visionary leader, gaining many disciples. He came to be widely identified as the inheritor of Shah Waliullah's mantle and numerous Sunni Muslims volunteered to join his cause.

Under these circumstances the call to Jihad against British rule began becoming popular amongst the Muslim masses. Shah Ismail Dehlvi, the nephew of Shah 'Abd al-Aziz and grandson of Shah Waliullah, would lead a religious revivalist movement. In addition to being an excellent orator, he was also a soldier and military commander. Shah Muhammad Ishaq, the grandson of Shah 'Abd al-Aziz would continue his religious reform after Abdul Aziz's death in 1823. Maulana Abdul Haie, son-in-law of Shah 'Abd al-Aziz was also a reputed scholar. These three theologians prepared the spadework of Tariqah-i-Muhammadiyya, the reform movement that would be known as the Indian "Wahhabi movement". During his last years, Shah 'Abd al-Aziz would give his cloak to Syed Ahmed Bareilly appointing him as his successor. Sayyid Ahmed would campaign against the corruption of various Sufi orders, and initiate his disciples into Tariqah-i-Muhammadiya ("Muhammadiyya Order"). The disciples in this order were required to make a vow that they will strictly abide by Sharia and would not follow anything not proven by Qur'an and Hadith.

One of the prominent disciples of Sayyid Ahmed was Wilayat Ali Khan, a student of Hajji Abdul Haq of Benares; popularly known as the "Nejdi Sheikh". Abdul Haq was an Islamic scholar who spent years studying in the remote Central Arabian Province of Nejd, the seat of the Wahhabi movement. Upon his return, he preached many of its militant ideals and had already established Wahhabi doctrines in South Asia before Sayyid Ahmad's Hajj in 1821. 'Abd al-Haqq would later become a member of Tariqah-i Muhammadiya and join Sayyid Ahmad's Hajj to Hejaz in 1821 along with his disciple Wilayat Ali. Unlike other members of the group, 'Abd al-Haqq travelled to Yemen to study under the theologian Muḥammad b. ʿAlī al-Shawkānī (d. 1834) and would become greatly influential in shaping the teachings of Ahl-i Hadith. Meanwhile Wilayat Ali Khan, being a disciple of both Sayyid Ahmad and the Najdi Sheikh, emerged as an important leader of Indian "Wahhabi" movement and its military campaigns of Jihad.

In 1821, Syed Ahmad embarked on a journey for Hajj in Hejaz accompanied by Shah Ismail Dehlvi and Maulana Abdul Haie with 400 disciples. They performed Hajj in 1823 (1237 A.H) and stayed in Hejaz for 8 months. Shah Ismail and Abdul Haie authored the Arabic book "Sirat e Mustaqim" to call Arabs to their reformative movement. They returned home in 1824. The three scholars then charted a strategic plan to wage Jihad against the colonial occupation across India. Many parts of the subcontinent became recruitment centres for the Mujahideen. When his Pathan disciples offered him territory, Syed Ahmed set-up the North West Frontier Province as the operations headquarters for the future "Wahhabite" Jihad in 1826 to re-take the subcontinent from the British. However this put the Mujahideen into conflict with the Sikh empire. In January 1827, Syed Ahmed was elected as Imam and Amir-ul-Mu'mineen (commander of faithful) by religious scholars and tribal chiefs. Soon war broke out between Sikhs and "Wahhabi" Mujahideen.