Musteika is a village in Varėna district municipality, in Alytus County, in southeastern Lithuania.

The largest Lithuanian swamp the Čepkeliai Marsh begins 6 kilometres (3.7 mi) to the East from Musteika.

Musteika forests hosts many rare and protected plant species, also grey wolf, European lynx, moose, crane population.

[5] Formerly (1975–2003), between Musteika and Grybaulia villages, there was a large aquiculture pool complex but it was abandoned and dried out.

Musteika is an ethnographic village and architecture monument, representing traditional Wood Dzūkian lifestyle.

Homesteads consist from traditional Dzūkish houses (called pirkia), granaries (svirnas), stables and stackyards.

Another cross in the Gandrų and Tilto streets' crossroad has been built to commemorate the massacre of 1944 St John's Day when Soviet soldiers killed 14 local men.

[8] The northern part of Musteika is the older one and till the beginning of the 20th century belonged to Vilna Governorate (Troki County, Merech volost) while the southern one (so called the Averkos' End) is later.

[5] The main occupations of Musteika's inhabitants were forestry, beekeeping, mushroom and berry picking, hunting, resin extraction.