Ljig (Serbian Cyrillic: Љиг) is a town and municipality located in the Kolubara District of western Serbia.

The recorded history of the Ljig settlement itself begins in 1911, when a railroad was built between Lajkovac and Gornji Milanovac.

An early reference to "Ljig" can be found in the 17th century records of Evliya Çelebi, which describe "LIGmehri" (the Ljig River) rising from Kara Dag in the village Baht (today's Ba) and flowing into the Kolubara River near Valjevo.

This lower area under the Gukoši hill includes a small settlement with a municipal court, school, inn, two stores, two textile mills, three tailors and several houses, and when still part of Gukoši had been referred to as the area "on the Ljig River."

The ethnic composition of the municipality:[5] The following table gives a preview of total number of registered people employed in legal entities per their core activity (as of 2018):[6]