阿糖胞嘧啶三磷酸（英语：Arabinofuranosylcytosine triphosphate）是一种抑制DNA合成的核苷酸。它是阿糖胞苷的生物活性形式。

Arabinofuranosylcytosine triphosphate is a nucleotide that inhibits the synthesis of DNA by acting as an antimetabolic agent against deoxycytidine (a component of DNA). It is the biologically active form of cytarabine.