Nicias (c. 470–413 BC) was an Athenian politician and general during the Peloponnesian War. The name may also refer to:

• Nicias (Indo-Greek king) (r. 90–85 BC), Indo-Greek king in modern-day Pakistan
• Nicias of Kos (died c. 20 BC), Greek tyrant of the island of Kos
• Nicias of Miletus (4th–3rd century BC), ancient Greek physician and epigrammatist
• Nicias (beetle) (Nicias alurnoides), a genus of beetles in the family Cerambycidae

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