七钼酸铵（化学式：(NH₄)₆Mo₇O₂₄），又称仲钼酸铵、钼酸铵，实验室常用试剂。

将浓度大于 10 mol/L 的钼酸铵溶液调节 pH 值为约5.5时，形成七钼酸铵。也可将三氧化钼的氨水溶液酸化，降低 pH 值为6时也生成七钼酸铵。

Ammonium heptamolybdate is the inorganic compound, normally encountered as the tetrahydrate, whose chemical formula is (NH₄)₆Mo₇O₂₄·4H₂O. It is a colorless solid, often referred to as ammonium paramolybdate or simply as ammonium molybdate, although "ammonium molybdate" can also refer to ammonium orthomolybdate, (NH₄)₂MoO₄, and several other compounds. Potassium heptamolybdate, also obtained as the tetrahydrate, is very similar to the ammonium salt.