Secundus of Asti was a Roman military officer and early Christian martyr who lived during the late 1st and early 2nd centuries. A member of the nobility in Asti, he served as a subaltern in the imperial army. According to historical accounts, he was executed by beheading in Asti during the reign of Emperor Hadrian. His conversion to Christianity is traditionally attributed to his interactions with Bishop Marcian and other religious figures, leading to his eventual death for his faith.