硫化镉是硫和镉的无机化合物，化学式为CdS。它是一种N型光电导半导体材料。属Ⅱ-Ⅵ族化合物半导体。分子量144.476,属六方晶格结构，晶格常数5.86×10-10m,熔点1750℃，禁带宽度2.41电子伏,电子和空穴的迁移率分别为2×10-2和2×10-3米2/伏·秒，相对介电常数11.6。硫化镉是一种黄色固体，几乎不溶于水，普遍在闪锌矿和纤锌矿杂质中发现，这亦是镉的主要来源。作为一种化合物，易于分离纯化。

Cadmium sulfide is the inorganic compound with the formula CdS. Cadmium sulfide is a yellow solid. It occurs in nature with two different crystal structures as the rare minerals greenockite and hawleyite, but is more prevalent as an impurity substituent in the similarly structured zinc ores sphalerite and wurtzite, which are the major economic sources of cadmium. As a compound that is easy to isolate and purify, it is the principal source of cadmium for all commercial applications. Its vivid yellow color led to its adoption as a pigment for the yellow paint "cadmium yellow" in the 18th century.