What is the title of the 2018 Assassin's Creed game set in ancient Greece?

The 2018 Assassin's Creed game set in ancient Greece is Assassin's Creed Odyssey.

Ubisoft released Odyssey in October 2018. The game is set during the Peloponnesian War in the fifth century BCE and allows the player to choose between two siblings, Alexios and Kassandra, as the main playable character.

Its world includes Athens, Sparta, the Greek islands, and other regions shaped by the conflict between the Athenian and Spartan alliances. The game emphasizes role-playing systems, dialogue choices, branching outcomes, exploration, and naval travel.

Odyssey follows Assassin's Creed Origins chronologically in the historical timeline, although Origins focuses on Ptolemaic Egypt and the early Hidden Ones. Odyssey is not a direct story about the established Assassin Brotherhood; instead, it explores earlier events connected to the series' ancient mythology and artifacts.