羟腈（cyanohydrin），又称氰醇（cyanoalcohol)，有机化合物的一类，是醛或酮分子中羰基发生氰化氢加成反应生成的化合物。

羟腈水解可得α-氨基酸，羟腈脱水可得α,β-不饱和酸。

羟腈为重要的有机合成中间产物。

醇及类似物 羟基氧被取代 醇 甲醇 乙醇 乙二醇 正丙醇 异丙醇 正丁醇 硫醇 甲硫醇 乙硫醇 乙二硫醇 正丙硫醇 异丙硫醇 正丁硫醇 硒醇 甲硒醇 乙硒醇 正丙硒醇 异丙硒醇 正丁硒醇 碲醇 甲碲醇 乙碲醇 正丙碲醇 正丁碲醇 钋醇 其他类似物 酚 醚 氰醇

A cyanohydrin is a functional group found in organic compounds. It is most commonly examples having a cyano and a hydroxy group attached to the same carbon atom with the formula R₂C(OH)CN, where R is H, alkyl, or aryl. Cyanohydrins are industrially important precursors to carboxylic acids and some amino acids. Cyanohydrins can be formed by the cyanohydrin reaction, which involves treating a ketone or an aldehyde with hydrogen cyanide (HCN) in the presence of excess amounts of sodium cyanide (NaCN) as a catalyst: