硝酸钙[Ca(NO₃)₂]是硝酸根离子与钙离子化和生成的无机盐。为无色透明单斜晶体。

硝酸钙易溶于水、甲醇、乙醇、戊醇、丙酮、醋酸甲酯及液氨。置于空气中易潮解。硝酸钙是氧化剂，遇到有机物、硫等就会燃烧爆炸，发出红色火焰。于132℃分解；若再加热至495～500℃时会分解为氧气和亚硝酸钙；若继续加热则分解生成氧化氮气体和氧化钙。

Calcium nitrate, also called Norgessalpeter (Norwegian saltpeter), is the inorganic compound with the formula Ca(NO₃)₂. This colourless salt absorbs moisture from the air and is commonly found as a tetrahydrate. It is mainly used as a component in fertilizers but has other applications. Nitrocalcite is the name for a mineral which is a hydrated calcium nitrate that forms as an efflorescence where manure contacts concrete or limestone in a dry environment as in stables or caverns. A variety of related salts are known including calcium ammonium nitrate decahydrate and calcium potassium nitrate decahydrate.