Arslanbey or Aslanbey () is a neighbourhood of the municipality and district of Kartepe, Kocaeli Province, Turkey.Mahalle, Turkey Civil Administration Departments Inventory. Retrieved 19 September 2023. Its population is 3,927 (2022). Before the Armenian genocide it was populated by Armenians and was known as Aslanbeg. The Armenian dialect of Aslanbeg had some unusual features; it was described by Hrachia Adjarian but now is extinct.

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