血管炎（英语：Vasculitis，复数形为vasculitides），一种因身体机能失调，出现发炎而造成血管破坏的症状，包括动脉跟静脉都会被影响。当发生在静脉时，被称为静脉炎（Phlebitis），发生于动脉时，则称为动脉炎（Arteritis）。淋巴管炎（Lymphangitis）有时也被视为是血管炎的一种。多数成因是自体免疫系统失调，攻击血管组织造成。

Vasculitis (plural: vasculitides) is a group of disorders that destroy blood vessels by inflammation. Both arteries and veins are affected. Lymphangitis is sometimes considered a type of vasculitis. Vasculitis is primarily caused by leukocyte migration and resultant damage.