The Bilen—also variously transcribed as Blin or Bilin and also formerly known as the Bogo or North Agaw—are an ethnic group on the Horn of Africa. They are primarily concentrated in central Eritrea, in and around the city of Keren and further south toward Asmara, the nation's capital.
The Bilen practice both Christianity and Islam. Muslim adherents mainly inhabit rural areas and have interbred with the adjacent Tigre, while Christian Bilen tend to reside in urban areas and have intermingled with the Biher-Tigrinya.
The Bilen speak the Bilen language as a mother tongue, which belongs to the Cushitic branch of the Afro-Asiatic language family. Many also speak other Afro-Asiatic languages such as Tigre and Tigrinya. In addition, younger Bilen often employ Arabic words and expressions in their everyday speech.