The 2011 by-election in Inverclyde took place on 30 June 2011. It was triggered by the death of the incumbent Labour MP, David Cairns on 9 May 2011 of acute pancreatitis. Cairns had won the Inverclyde constituency in 2010 with a majority of 38.4%, making it a safe Labour seat. The by-election was won by Iain McKenzie MP, the Labour candidate.