Tran is a small town in Pernik Province, western Bulgaria. It is 27 kilometres away from the town of Breznik and 15 km from the border with Serbia. The town was first mentioned in 1451 as Tran; its name was also rendered as Turun, Tuin, Turan, Taran throughout the 15th–16th centuries. Under the Ottoman Empire, it was also called Isnebol, and belonged to the Sanjak of Niš.
One distinctive feature of the town is the dialect of the Bulgarian language spoken in Tran, which is part of the Torlakian dialect group, which is transitional to Serbian, making it hard for Bulgarians from e.g. Pernik to understand. The Erma River which flows from the town has formed a magnificent george known as Transko Zhdrelo. Tran holds the Bulgarian lowest temperature record at −38.3°C (−36.94°F) registered in the winter of 1947.