Elections to Comhairle nan Eilean Siar (Western Isles Council) were held on 3 May 2012, the same day as the other Scottish local government elections. The election was the second one using the 9 wards created as a result of the Local Governance (Scotland) Act 2004. Each ward elected three or four Councillors using the single transferable vote system: a form of proportional representation. A total of 31 Councillors were elected.