血管收缩，亦即血管收窄，是指体内血管管腔收窄，这会造成血压的上升。它的相反过程称为血管舒张。

血管收缩可以是由血管收缩剂造成。血管收缩剂是针对特定的受体，如抗利尿激素受体或肾上腺素受体。血管收缩剂亦会在临床使用增加血压或减低局部的血液流量。

此外，当面对高度的压力时会引发血管收缩。当环境寒冷时，血管收缩亦会在恒温动物的表面血管出现。这个过程目的是要使温暖的血液转流向动物的中央，防止体温的流失。

Vasoconstriction is the narrowing of the blood vessels resulting from contraction of the muscular wall of the vessels, in particular the large arteries and small arterioles. The process is the opposite of vasodilation, the widening of blood vessels. The process is particularly important in staunching hemorrhage and acute blood loss. When blood vessels constrict, the flow of blood is restricted or decreased, thus retaining body heat or increasing vascular resistance. This makes the skin turn paler because less blood reaches the surface, reducing the radiation of heat. On a larger level, vasoconstriction is one mechanism by which the body regulates and maintains mean arterial pressure.