氧化钼（VI），也称三氧化钼，是钼和氧的化合物，近似化学式为MoO3。它通常是白色或浅黄色，不过氧化钼（VI）中可能存在大量缺陷，包括氧空位，这使其呈浅蓝色或浅绿色。氧化钼（VI）具有 2,620 °C的高熔点。从化学性质来看，氧化钼（VI）是强氧化剂，具有高功函数。 因此，它可用作化学反应的催化剂以及生产其它钼化合物的起始原料。此外，它还可以添加到色素、玻璃、润滑剂和塑料中。 Molybdenum(VI) oxide, also known as molybdenum trioxide, is a compound of molybdenum and oxygen with the approximate chemical formula of MoO3. Typically, it a white or light yellow powder, although molybdenum(VI) oxide can adopt a high concentration of defects including oxygen vacancies that impart a bluish or greenish color. Molybdenum(VI) oxide has a high melting point of 2,620 °C. Chemically, molybdenum(VI) oxide is a strong oxidizing agent and has a high work function. Consequently, it is used as a catalyst in chemical reactions and as a starting material to produce other molybdenum compounds. In addition, it is added to pigments, glasses, lubricants, and plastics.