Siak

Siak may refer to:

• Asiagh (असियाग) (Siak (सियाक)), a gotra/clan of Jats found in India.
• Eric Low Siak Meng, a Singaporean Chinese politician.
• Siak Regency, a regency of Riau, Indonesia.
• Siak River, a river in Sumatra, Indonesia.
• Sultanate of Siak Sri Indrapura in Sumatra, Indonesia.
• Siunia Dynasty, alternatively known as Siak, a dynasty that ruled part of what is now Armenia.