The 2021 Liberal Party of Australia (Victorian Division) leadership spills were two spill motions on 16 March and 7 September 2021 against the leader of the Victorian branch of the Liberal Party and Leader of the OppositionMichael O'Brien, who had held these roles since December 2018. The September spill motion was successful and resulted in a ballot to elect the new party leader and deputy party leader on the same day. Former leader, Matthew Guy, was elected unopposed as the party leader and Leader of the Opposition. Caulfield MP David Southwick defeated Louise Staley in the Deputy Leadership contest and was elected Deputy Leader, replacing Cindy McLeish who had been elected alongside O'Brien in 2018.
