Nikolski is a census-designated place (CDP) on Umnak Island in Aleutians West Census Area, Alaska, United States. The population was 39 at the 2020 census, up from 18 in 2010. Nikolski is on Nikolski Bay, off the southwest end of the island. It is 116 air miles west of Unalaska, and 900 air miles from Anchorage. Residents are known as Unangan, and Aleut is spoken in most of the remaining homes.

Aleut or Unangam Tunuu is the language spoken by the Aleut living in the Aleutian Islands, Pribilof Islands, Commander Islands, and the Alaska Peninsula. Aleut is the sole language in the Aleut branch of the Eskimo–Aleut language family. The Aleut language consists of three dialects, including Unalaska, Atka/Atkan, and Attu/Attuan.