血管新生（英文：Angiogenesis）是一个生理上新的微血管发展成一个血流供应系统的过程。而Vasculogenesis通常指自发性的血管形成，另外Intussusception则是指较一般快速形成的血管新生过程。

这一过程在人体生长与发育，及伤口愈合中常见。另外，血管新生是肿瘤恶化过程中的重要步骤。

血管新生在于生长或是发育上扮演重要的角色，例如在伤口愈合、女性经期、胎儿生长发育。而在肿瘤生长上，血管新生则会是肿瘤从休眠期转变成恶性、生长迅速、可能侵袭其他组织的关键。而相较于癌症的研究，血管新生也在断肢接合、心肌梗塞、脑中风、老人退化性黄斑等病症上占有很重要的地位。

Angiogenesis is the physiological process through which new blood vessels form from pre-existing vessels. This is distinct from vasculogenesis, which is the de novo formation of endothelial cells from mesoderm cell precursors. The first vessels in the developing embryo form through vasculogenesis, after which angiogenesis is responsible for most, if not all, blood vessel growth during development and in disease.