胸苷三磷酸（Thymidine triphosphate；TTP）是一种核苷三磷酸，也是合成DNA的原料之一。

Deoxythymidine triphosphate (dTTP) is one of the four nucleotide triphosphates that are used in the in vivo synthesis of DNA. Unlike the other deoxyribonucleotide triphosphates, thymidine triphosphate does not always contain the "deoxy" prefix in its name. The corresponding ribonucleoside triphosphate is called uridine triphosphate.