The Tirap district  is located in the southeastern part of the state of Arunachal Pradesh in India. It shares a state border with Nagaland and Assam, an international border with Myanmar and a district border with Changlang and Longding.

Since time immemorial, Tirap has been inhabited by ancestors of the indigenous tribes. Tribes such as the Nocte came to settle in the area during the 16th century, at the time of reign of the Ahoms. Japanese troops invaded and controlled the area for a brief period in 1945, until the collapse of the Japanese Empire. After their collapse Suman Gope came to power. Of late, Tirap has also been a major target for the NSCN, a Naga rebel group who aims for creation of Greater Nagaland, using military force.

On 14 November 1987, Tirap was bifurcated to create the new Changlang district. In 2013 Tirap was again split to create Longding District

Tirap district occupies an area of 2,362 square kilometres (912 sq mi),comparatively equivalent to Canada’s Cornwall Island.The elevation ranges from 200 meters in the northwest to 4,000 meters in the Patkai Hills.

In Tirap district the educational institute known as Ramakrishna Mission School plays a major role to uplift the education system of Tirap.

According to the 2011 census Tirap district has a population of 111,997, roughly equal to the nation of Grenada.This gives it a ranking of 613th in India (out of a total of 640).The district has a population density of 47 inhabitants per square kilometre (120/sq mi) .Its population growth rate over the decade 2001–2011 was 11.63%.Tirap has a sex ratio of 931 females for every 1000 males, and a literacy rate of 52.23%.

In Tirap district Nocte is the most populated tribe, th area. Most of the people in Tirap are Christians.

Much of the tribal population consists of the Naga related Nocte, Konyak and Wancho, who traditionally followed Animism, although most of them have converted to Christianity. Smaller communities of two other Naga tribes, Tutsa and Tangsa, besides non-Naga Singhpo can be found in the district as well. Festive fairs and festivals such as the Loku of the Nocte, Oriya or Ojiyele of the Wancho and the Pongtu festival of the Tutsa are celebrated in full flair. Along with these festivals Durga Puja is also celebrated here.

Christianity was first introduced in Arunachal Pradesh in the district of Tirap. Borduria became the first village to observe silver jubilee of Catholic Church in the state in 2004. Tirap boasts a number of Christian missionaries from many parts of India. These had resulted in significant proportions of the Hindu Nocte tribe converting to Christianity, especially in its stronghold in Khonsa.