Ile Alatau (, Іле Алаtауы), also spelt as Trans-Ili Alatau, etc., is a part of the Northern Tian Shan mountain system (ancient Mount Imeon) in Kazakhstan and Kyrgyzstan. It is the northernmost mountain range of Tian Shan stretching for about with a maximal elevation of (Talgar Peak). The term Alatau refers to a kind of mountain. The range is bounded from the north by the Ili Depression of the Ili River, hence the name.