单磷酸胞苷（Cytidine monophosphate，或译胞苷一磷酸、胞苷酸；缩写CMP）是一种核苷酸，可见于RNA分子内。组成物为磷酸官能基、五碳糖以及碱基胞嘧啶。

Cytidine monophosphate, also known as 5'-cytidylic acid or simply cytidylate, and abbreviated CMP, is a nucleotide that is used as a monomer in RNA. It is an ester of phosphoric acid with the nucleoside cytidine. CMP consists of the phosphate group, the pentose sugar ribose, and the nucleobase cytosine; hence, a ribonucleoside monophosphate. As a substituent it takes the form of the prefix cytidylyl-.