Riau (disambiguation)

Riau is a province of Indonesia.

Riau may also refer to:

• Riau Islands, province of Indonesia
• Riau Archipelago, part of Riau Islands Province
• Riau-Lingga Sultanate, a Malay Sultanate that once governed Riau-Lingga Archipelago
• Riau Residency, administrative unit of the Dutch East Indies
• Revolutionary Insurgent Army of Ukraine (RIAU)