Blangkejeren is a small town and an administrative district (kecamatan) in Aceh Province of Indonesia. The town is the seat (capital) of Gayo Lues Regency. The district has an area of with a population of 32,164 people as of mid-2024, giving a population density of . The town (gampong), Kota Blaenkejeren, is located within the district, and covers an area of 0.42 km<sup>2</sup> with a population of 2,368 as at mid 2023, although adjoining gampong such as Kuta Lintang (3,781 inhabitants) and Kampung Jawa (2,431 inhabitants) form part of a common built-up area.
Blangkejeren is located in the upper reaches of the Tripa River Basin, at an elevation of approximately 920 metres above sea level. It is a highland town nestled in the Bukit Barisan mountain range of Sumatra.
Blangkejeren has a tropical rainforest climate (Af) with moderate to heavy rainfall year-round.