The Shardak (Bashkir: Шарҙаҡ) is a river in the Tatyshlinsky District of Bashkortostan, in Russia; it flows into the river (Bashkir: Йоҡ, a tributary of the Bystry Tanyp). It flows past the villages (Bashkir: Иҫке Шарҙаҡ ) and New Shardak (Bashkir: Яңы Шарҙаҡ).