The early 3rd-century text called Acts of Thomas is one of the New Testament apocrypha. References to the work by Epiphanius of Salamis show that it was in circulation in the 4th century. The complete versions that survive are Syriac and Greek. There are many surviving fragments of the text. Scholars detect from the Greek that its original was written in Syriac, which places the Acts of Thomas in Edessa. The surviving Syriac manuscripts, however, have been edited to purge them of the most unorthodox overtly Encratite passages, so that the Greek versions reflect the earlier tradition.

Fragments of four other cycles of romances around the figure of the apostle Thomas survive, but this is the only complete one. It should not be confused with the early "sayings" Gospel of Thomas. "Like other apocryphal acts combining popular legend and religious propaganda, the work attempts to entertain and instruct.