核糖醇（Ribitol）是一种从核糖还原得到的晶状戊糖醇。它是维生素B2和磷壁酸的组成部分之一。也天然存在于春侧金盏花中。

Ribitol or adonitol is a crystalline pentose alcohol (C₅H₁₂O₅) formed by the reduction of ribose. It occurs naturally in the plant Adonis vernalis, as well as in the cell walls of Gram positive bacteria (specifically, as ribitol phosphate, in teichoic acids). It also contributes to the chemical structure of riboflavin and flavin mononucleotide (FMN), which is a nucleotide coenzyme, present in the enzyme glycolate oxidase.