Nawab Muhammad Amir Khan (1769–1834) was a leader, of Pashtun origin belonging to a subtribe of Tarkani tribe from today's northwest Pakistan and Afghanistan. He was a military general in the service of Yashwantrao Holkar of the Maratha Empire and later became the first ruler of the princely state of Tonk (in the present day Rajasthan state of India). He was the son of Hayat Khan and the grandson of Taleh Khan.He is often confused as a member of the Pindaris although he was a Pathan with his Pathan contingency. British colonial writers sometimes tended to confuse the Pathans as part of the Pindaris.
Amir Khan rose to be a military commander in the service of Yashwantrao Holkar of the Maratha Empire in 1798. In 1806, Khan received the state of Tonk from Yashwantrao Holkar of the Maratha Empire.
While the Pindaris tended to concentrate on the east and south central Hindustan, Amir Khan and his Pathans concentrated on the north and Rajasthan. At the height of his power, he is said to have controlled a personal following of 8,000 cavalry, 10,000 infantry and up to 200 guns. The largest contingent amongst the Pindari chiefs, by far.
In return for their services, the Maratha rulers of Gwalior, Indore and Berar often conferred land grants on the Pindaris. By the early years of the nineteenth century, these yielded additional revenues of between Rs 800,000 and Rs 2 million per annum. Sometimes, they would 'refrain from plunder' on the payment of large financial indemnities from their intended prey.
After the defeat of the Rohillas in the Rohilla War of 1774–5 against the British, he fought against them. He had acquired the town and pargana of Tonk and the title of Nawab from Yashwantrao Holkar in 1806, and this area together with some other scattered parganas that he held, was combined with the pargana of Rampura (Aligarh) and erected into a new principality. Ultimately he established his rule in Tonk in 1806.