Lyulin (Bulgarian: Люлин or Люлин планина) is a range of hills in western Bulgaria, located several kilometres west of Sofia. The highest point is Dupevitsa Peak (1,256 m). The Buchino Pass divides the hills into two, a western and an eastern part. Bonsovi Polyani are a popular tourist attraction.

On the slopes of Liulin are some of the most beautiful quarters of Sofia – Knyazhevo, Gorna Banya and Bankya, known with their mineral springs.