Vejle is a town in Denmark, in the southeast of the Jutland Peninsula at the head of Vejle Fjord, where the Vejle River and Grejs River and their valleys converge. It is the site of the councils of Vejle Municipality (kommune) and the Region of Southern Denmark. The city has a population of 57,655 (as of 1 January 2020), making it the ninth largest city in Denmark. Vejle Municipality has a population of 111,743 (as of 2016). The city is part of the Triangle Region, which includes the neighbouring cities of Kolding and Fredericia.

Vejle is most known for its forested hills, fjord, harbour, shopping, pedestrian mall, and windmill.

Downtown Vejle was built on an island of glacial till in Vejle River remaining from a hill formed during the last ice age.

For a country where the highest natural elevation is only about 170 m (558 ft) above sea level, Vejle is known for the forested hills that rise to the north and south of the town and fjord.

The valleys of the two rivers that converge at Vejle are both unique in Denmark: Vejle River Valley (Vejle Ådal) is the longest tunnel valley in Denmark, and the Grejs Valley (Grejsdalen) is the largest ravine in Denmark.

Both empty into Vejle Fjord, which connects Vejle by water through the Little Belt strait to the Baltic Sea, and through the Kattegat and Skagerrak straits to the Atlantic Ocean.