Lavaur (; ) is a commune in the Tarn department in southern France.
Lavaur was taken in 1211 by Simon de Montfort during the wars of the Albigenses, a monument marking the site where Dame Giraude de Laurac (Lady of Lavaur) was killed, being thrown down a well and stoned to death. The town was also taken several times during the religious wars of the 16th century.
Lavaur stands on the left bank of the Agout, which is here crossed by a railway-bridge and a fine stone bridge of the 1770s. It lies 36 km southwest of Albi and 32 km east of Toulouse.
The town carries on distilling and flour-milling and the manufacture of brushes, plaster and wooden shoes.
There is a subprefecture and a tribunal of first instance (a lower Court of Justice).