紫薇属（学名：Lagerstroemia）是千屈菜科下的一个属，为灌木或乔木植物。该属共有约55种，分布亚洲东部至南部和澳大利亚北部。

Lagerstroemia /ˌleɪɡərˈstriːmiə/, commonly known as crape myrtle or crepe myrtle "banaba" (Tagalog), is a genus of around 50 species of deciduous and evergreen trees and shrubs native to the Indian subcontinent, southeast Asia, northern Australia, and parts of Oceania, cultivated in warmer climates around the world. It is a member of the family Lythraceae, which are also known as the loosestrife family. The genus is named after the Swedish merchant Magnus von Lagerström, who supplied Carl Linnaeus with plants he collected. These flowering trees are beautifully colored and are often planted both privately and commercially as ornamentals.