Pechengsky District (Russian: Пе́ченгский райо́н; Finnish: Petsamo; Norwegian: Peisen; Northern Sami: Beahcán; Skolt Sami: Peäccam) is an administrative district (raion), one of the six in Murmansk Oblast, Russia. As a municipal division, it is incorporated as Pechengsky Municipal District. It is located in the northwest of the oblast, on the coast of the Barents Sea (by the Rybachy Peninsula, which is a part of the district) and borders Finland in the south and southwest and Norway in the west, northwest, and north. The area of the district is 8,662.22 square kilometers (3,344.50 sq mi). Its administrative center is the urban locality (an urban-type settlement) of Nikel. Its population was 38,920 (2010 census); 46,404 (2002 census); 59,495 (1989 Soviet census). The population of Nikel accounts for 32.8% of the district's total population.

The area was long inhabited by the indigenous Sami people. The border between Norway and Russia was not defined in terms of land, instead the Treaty of Novgorod (1326) specified which indigenous, nomadic families had to pay their taxes to which government. In 1533, the settlement of the Pechenga Monastery was defined as part of Russia.

The settlement of Pechenga was founded as the Pechenga Monastery in 1533 at the influx of the Pechenga River into the Barents Sea, 135 kilometers (84 mi) west of modern Murmansk, by St. Tryphon, a monk from Novgorod. Inspired by the model of the Solovetsky Monastery, Tryphon wished to convert the local Skolt Sami population to Christianity and to demonstrate how faith could flourish in the most inhospitable lands.

The area was resettled by the Pomors and other Russians. The present border between Norway and Russia was settled in 1826, and the development of the area considerably accelerated in the late 19th century, when the monastery was re-established there. The harbor of Liinakhamari in Petsamo was important for the Russian economy during World War I as the Baltic Sea was blocked by the Germans.

According to the 1920 Treaty of Tartu that followed Finnish occuрation of the region, Soviet Russia ceded the area of Pechenga (Petsamo Province) to Finland.

Deposits of nickel were found in 1921, after Petsamo became a part of Finland. In 1934, the deposits were estimated at over five million tonnes. Mining operations were started in 1935 by Canadian and French corporations.

Construction of a road from Sodankylä through Ivalo to Liinakhamari started in 1916 and was completed in 1931. This made Petsamo a popular tourist attraction, as it was the only port by the Barents Sea reachable by automobile.

In the Winter War of 1939–1940, the Soviet Union briefly occupied Petsamo. In the following peace agreement, the Rybachy Peninsula, with the area of 321 square kilometers (124 sq mi), was the only part of Petsamo ceded to the Soviet Union, although the Soviets had occupied all of Petsamo during the Winter War.