血浆铜蓝蛋白（英语：Ceruloplasmin）由肝脏细胞制造，重约151千道尔顿(kDa)，包含六个铜离子。在血液中，血浆铜蓝蛋白携带了90%的铜离子，另外10%由白蛋白(albumin)携带。血浆铜蓝蛋白的主要作用是进行依赖铜离子的氧化反应，反应时将二价铜离子还原成一价，而把铁离子由二价氧化成三价，成为可以与运铁蛋白(transferrin)结合的型态。 因为血浆铜蓝蛋白是由肝脏制造，所以当有肝脏疾病时其含量就会下降。或是因为基因缺陷而无法制造，如原血浆铜蓝蛋白缺乏症(Aceruloplasminemia)。在怀孕、淋巴瘤、慢性发炎、类风湿性关节炎的情况下血浆铜蓝蛋白在血液中的含量则会上升。

Ceruloplasmin (or caeruloplasmin) is a ferroxidase enzyme that in humans is encoded by the CP gene.

Ceruloplasmin is the major copper-carrying protein in the blood, and in addition plays a role in iron metabolism. It was first described in 1948. Another protein, hephaestin, is noted for its homology to ceruloplasmin, and also participates in iron and probably copper metabolism.