Athanasius I may refer to:
- Athanasius of Alexandria (c. 293 – 373), also called Pope Athanasius I of Alexandria, Christian theologian
- Athanasius I Gammolo (died 631), Syriac Patriarch of Antioch
- Athanasius I (bishop of Naples) (830–872)
- Athanasius I of Constantinople (1230–1310), Ecumenical Patriarch of Constantinople
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