Sixtus I
- circa AD 42 – AD 120s
- Ancient
- World History

Pope Sixtus I, also spelled Xystus, a Roman of Greek descent, was the bishop of Rome from c. 117 or 119 to his death c. 126 or 128. He succeeded Alexander I and was in turn succeeded by Telesphorus. His feast is celebrated on 6 April.
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