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Arkadios is a Greek personal name derived from the region of Arcadia. Arcadius is the Latin form. The Slavic derivation Arkady is common in Russia and other countries today. In the works of Harry Turtledove, Arkadios and its variants may refer to:
- Arkadios (Unholy Trinity), a strategos and minor character in the Agent of Byzantium story "Unholy Trinity."
- Arkadios (Videssian), a Phos cleric in Bridge of the Separator.
- Arkady (The War That Came Early), a pilot and minor character in The War That Came Early: Two Fronts.
- Arkady Lapshin, fictional Soviet tank commander in The Hot War.