Rohillas are a mixed Indian community of Pashtun heritage, historically found in Rohilkhand, a region in the state of Uttar Pradesh, India. It forms the largest Pashtun diaspora community in India, and has given its name to the Rohilkhand region. The Rohilla military chiefs settled in this region of northern India in the 1720s, the first of whom was Ali Mohammed Khan.
The Rohillas are found all over Uttar Pradesh, but are more concentrated in the Rohilkhand regions of Bareilly and Moradabad divisions. Between 1838 and 1916, some Rohillas migrated to Guyana, Suriname and Trinidad and Tobago in the Caribbean region of the Americas in which they form a subset of the Muslim minority of the Indo-Caribbean ethnic group. After the 1947 Partition of India, many of the Rohillas migrated to Karachi, Pakistan as a part of the Muhajir community.
The Indian term Rohilla originated from Roh, meaning the hilly country, where Rohilla was used as a fairly broad notion of the people from Roh. Later Roh referred to a geographical term which corresponded with, in its limited sense, the territory stretching from Swat and Bajaur in the north to Sibi in the south, and from Hasan Abdal (Attock) in the east to Kabul and Kandahar in the west, which corresponded with the homeland of the Pashtuns. The Pashtun or primarily Yusufzai migrations towards Northern India could be traced to their expulsion from Kandahar due to the Turko-Mongol invasions, who were subsequently resettled in Kabul, where they were again dispelled by the Timurids and forced to settle in Swat, where they assimilated the native Dardic and Tajik Dehqan population, who were collectively termed Yusufzais to the outside. A further migration continued towards Northern India, where typically inhabitants in the valley without land and those seeking trade opportunities quitted the country of Roh and migrated to India. The immigration of Pashtuns from the Peshawar valley was further exacerbated with the collapse of Mughal authority and the invasion of Nader Shah.