Nikolski (Chalukax̂[2] in Aleut; Russian: Никольский) is a census-designated place (CDP) on Umnak Island in Aleutians West Census Area, Alaska, United States.

The Aleutian Pribilof Islands Association reports that Nikolski is thought to be one of the oldest continuously occupied communities in the world.

Archaeological evidence from Ananiuliak Island, 5 km offshore in Nikolski Bay, dates human habitation to 8,500 years ago.

In the early 1900s the residents purchased a large fishing boat with money made from those activities, the “Umnak Native”, but it was wrecked in 1933.

In June 1942 during World War II, the Japanese attacked Unalaska to the East and had also seized Attu and Kiska islands, to the west.

Nikolski locals returned in 1944, but some had experienced the outside world for the first time and since then, many natives have remained offshore, working in canneries or on fishing vessels.

A 3,500-foot gravel runway, the unattended Nikolski Air Station remains, and there are passenger, mail and cargo services depending on the harsh weather conditions.

Snowfall is considerable and covers Mount Vsevidof and other peaks, with rain and strong winds much of the year, and summer fog.

On a clear day the view from Nikolski is dominated by Mount Vsevidof to the northeast, the highest point on Umnak Island (7,051 ft; 2,149 m).

A cataclysmic eruption of Mount Okmok in the northernmost part of the island severely affected Nikolski residents in July 2008.

Beginning in 1998, schools in rural Alaska had to have at least 10 students, in order to retain funding from the state, and campuses not meeting the number had to close.

[21] An episode of angler and TV presenter Jeremy Wade's Dark Waters (2019) was partially filmed in Nikolski.

He failed to catch elusive large halibut offshore, and was stranded due to bad weather for several days.