Agis may refer to:

• Agis I, a Spartan King.
• Agis II, a Spartan King
• Agis III, a Spartan King
• Agis IV, a Spartan King. Plutarch included a chapter on him in his Parallel Lives
• Agis, a Paionian king of the pre-Hellenistic era
• Agis of Argos, an ancient Greek poet
• AGIS (Apex Global Internet Services), a former Internet service provider

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