镍镉电池（Nickel-cadmium battery，通常简称NiCd，读作"nye-cad"）是一种流行的蓄电池。这种电池以氢氧化镍（NiOH）及金属镉（Cd）作为产生电能的化学品。

对比其他种类的蓄电池，镍镉电池的优势是：放电时电压变化不大，内阻小，对轻度的过充过放相对镍氢电池和锂电池来说容忍度较大。

镍镉电池的缺点则是记忆效应及镉的重金属污染。

须注意的是NiCad这简称是SAFT Corporation的注册商标，原不应被视作一般镍镉电池的简称。

The nickel–cadmium battery (NiCd battery or NiCad battery) is a type of rechargeable battery using nickel oxide hydroxide and metallic cadmium as electrodes. The abbreviation Ni-Cd is derived from the chemical symbols of nickel (Ni) and cadmium (Cd): the abbreviation NiCad is a registered trademark of SAFT Corporation, although this brand name is commonly used to describe all Ni–Cd batteries.