葡萄糖-6-磷酸（英语：Glucose 6-phosphate），也称6-磷酸葡萄糖，是葡萄糖经过磷酸化（在第6号碳）之后生成的分子。它也是生物细胞中的常见分子，参与磷酸戊糖途径与糖酵解等生化途径。

在糖酵解中，这个分子是由第一个步骤形成，进行催化的酶是己糖激酶或其他类似的酶。葡萄糖-6-磷酸在糖酵解中，会经由磷酸葡萄糖异构酶的催化，而形成果糖-6-磷酸，以继续接下来的步骤。

位于KEGG途径数据库化合物 C00668 位于KEGG途径数据库的酶5.3.1.9 位于KEGG途径数据库化合物 C05345 位于KEGG途径数据库的反应R00771

Glucose 6-phosphate (also known as Robison ester) is glucose sugar phosphorylated on carbon 6. This compound is very common in cells as the vast majority of glucose entering a cell will become phosphorylated in this way.

Because of its prominent position in cellular chemistry, glucose 6-phosphate has many possible fates within the cell. It lies at the start of two major metabolic pathways: glycolysis and the pentose phosphate pathway. In addition to these metabolic pathways, glucose 6-phosphate may also be converted to glycogen or starch for storage. This storage is in the liver and muscles in the form of glycogen for most multicellular animals, and in intracellular starch or glycogen granules for most other organisms.