Siân

Sian may refer to:

• Xi'an, China, formerly romanized as Sian
• Sian, Iran (disambiguation), various places in Iran

Siân (also Sian, Shân, Sharn, and Shan; pronounced ) is a Welsh feminine given name, equivalent to the English Jane, Scottish Sheena or Irish Siobhán.

Sian, Syan or Siyan (سيان in Kurdish) are a Kurdish tribe that live in southern Erbil, as well as Mekhmur, Deshti-Qeraj, and Girdesor villages in Iraq.