磷酸铝（化学式：AlPO₄）是一种无机化合物，用途包括在玻璃生产过程中充当助熔剂，作陶瓷或牙齿的黏合剂，以及作为添加剂加入于润肤剂、防火涂料、导电水泥等物料之中。

Aluminium phosphate (AlPO₄) is a chemical compound. The anhydrous form is found in nature as the mineral berlinite. Many synthetic forms of anhydrous aluminium phosphate are known. They have framework structures similar to zeolites and some are used as catalysts or molecular sieves. The dihydrate, AlPO₄·2H₂O is found as the minerals variscite and meta-variscite. A synthetic hydrated form, AlPO₄·1.5H₂O is also known. Commercially, an aluminium phosphate gel is available.