Ammonium molybdate is widely used in analytical chemistry as a reagent for the detection of phosphates, silicates, and arsenates. It forms a characteristic yellow precipitate when reacting with phosphates, making it valuable in water quality testing and environmental monitoring. In agriculture, it serves as a source of molybdenum in fertilizers to address soil deficiencies, promoting healthy plant growth. Additionally, it is utilized in the production of catalysts for the petroleum industry, aiding in processes like hydrodesulfurization. It also finds application in the manufacturing of pigments and corrosion inhibitors for metals.

Furthermore, it is used as a starting material for producing other chemicals such as molybdenum oxide and other molybdenum compounds used in the metal industry and plating. It acts as a catalyst in certain chemical processes, such as organic synthesis. In the paint and coating industry, it is used as an additive to improve adhesion and durability of the coating layers. Moreover, it is employed in the production of glass and ceramics to enhance their physical and chemical properties.