碳酸镍（英文:Nickel(II) carbonate）是一种无机化合物，属于碳酸盐，化学式为NiCO₃。碳酸镍具有水合物结构Ni₄CO₃(OH)₆(H₂O)₄。碳酸镍外观为绿色固体，为晶格状态，并包含Ni离子

这碳酸盐是一个从矿石湿式冶金提纯镍，用于电镀镍，碳酸镍也用在一些陶瓷的应用和前体的催化剂。

碳酸镍与水接触后会水解，会生成水合镍离子[Ni(H₂O)₆]，并释放水和二氧化碳。

煅烧（加热驱赶二氧化碳和水），会使碳酸镍分解，生成二氧化碳和氧化镍。这里使用的是无水碳酸镍

Nickel(II) carbonate describes one or a mixture of inorganic compounds containing nickel and carbonate. From the industrial perspective, the most important nickel carbonate is basic nickel carbonate with the formula Ni₄CO₃(OH)₆(H₂O)₄. Simpler carbonates, ones more likely encountered in the laboratory, are NiCO₃ and its hexahydrate. All are paramagnetic green solid containing Ni cations. The basic carbonate is an intermediate in the hydrometallurgical purification of nickel from its ores and is used in electroplating of nickel.