Mount Simeon or Mount Simon (Arabic: جبل سمعان Jabal Semʻān [ˈd͡ʒæbæl sæmˈʕaːn]), also called Mount Laylūn (Arabic: جبل ليلون, Kurdish: Çiyayê Lêlûn), is a highland region in Aleppo Governorate in northern Syria. The mountain is located in the Mount Simeon and Aʻzāz districts of Aleppo Governorate. Part of the mountain is located in the contemporary Afrin canton.
Mount Simeon is part of the Limestone Massif in the western part of the Aleppo plateau. It is located about 20 km northwest of Aleppo. The mountain runs for 50 km from north to south with a width range of 20–40 km and average elevation of 500–600 m. The highest point is Sheikh Barakāt (876 m) in the southern part of the mountain.
The valley of River ʻIfrīn runs between Mount Simeon and Mount Kurd to the west. Aʻzāz valley marks the northern boundary of the mountain, beyond which lies the Aʻzāz plain and Mount Barṣa (Barṣāyā) on the Aintab plateau. The valley of river Quweiq runs along the eastern side of the mountain. South of the mountain lie the Dāna and Atarib plains. Old routes connecting Qinnasrin to Antioch run through these plains to the ʻIfrīn valley at its westward turn and separate Mount Simeon from Ḥārim Mountains to the south.