| Election Name: | March 2021 Victorian Liberal Party leadership spill |
| Flag Image: | Liberal-Party-of-Australia-stub.svg |
| Type: | presidential |
| Vote Type: | Caucus |
| Ongoing: | no |
| Previous Election: | 2018 Liberal Party of Australia (Victorian Division) leadership election |
| Previous Year: | 2018 |
| 1Blank: | Votes |
| 2Blank: | Seat |
| 3Blank: | Faction |
| Candidate1: | Michael O'Brien |
| 1Data1: | 22 |
| 2Data1: | Malvern |
| Percentage1: | 70.97% |
| Colour1: | 0047AB |
| Candidate2: | Spill motion |
| 1Data2: | 9 |
| Colour2: | 0047AB |
| Percentage2: | 29.03% |
| Next Election: | 2021 Liberal Party of Australia (Victorian Division) leadership spills#Second spill motion: 7 September |
| Next Year: | Sep. 2021 |
| Election Date: | 16 March 2021 |
| Leader | |
| Election Name: | September 2021 Victorian Liberal Party leadership spill |
| Flag Image: | Liberal-Party-of-Australia-stub.svg |
| Type: | presidential |
| Vote Type: | Caucus |
| Ongoing: | no |
| Previous Election: | 2021 Liberal Party of Australia (Victorian Division) leadership spills#First spill motion: 16 March |
| Previous Year: | Mar. 2021 |
| 1Blank: | Votes |
| 2Blank: | Seat |
| 3Blank: | Faction |
| Candidate1: | Spill motion |
| 1Data1: | 20 |
| Colour1: | 0047AB |
| Percentage1: | 64.52% |
| 1Data2: | 11 |
| 2Data2: | Malvern |
| Percentage2: | 35.48% |
| Colour2: | 0047AB |
| Election Date: | 7 September 2021 |
| Leader | |
| After Election: | Vacant |
| Election Name: | September 2021 leadership election |
| Flag Image: | Liberal-Party-of-Australia-stub.svg |
| Type: | presidential |
| Vote Type: | Caucus |
| Ongoing: | no |
| 1Blank: | Caucus |
| 2Blank: | Seat |
| 3Blank: | Faction |
| Candidate1: | Matthew Guy |
| 1Data1: | Unopposed |
| 2Data1: | Bulleen |
| Colour1: | 0047AB |
| Next Election: | 2022 Liberal Party of Australia (Victorian Division) leadership election |
| Next Year: | 2022 |
| Election Date: | 7 September 2021 |
| Leader | |
| Before Election: | Vacant |
| After Election: | Matthew Guy |
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 Opposition Michael 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.
Following "months"[1] of speculation surrounding the leadership of the Party, a spill motion was brought on at a party-room meeting on 16 March by long-time Liberal member of the Legislative Council Bruce Atkinson.[1] It was believed that little-known Gembrook MP, and Shadow Spokesperson for roads, youth justice and crime prevention, Brad Battin, was pushing for a spill motion, with his intention to contest for the leadership.[2] However, as Battin likely didn't have the votes to secure the motion, nor his success to the leadership, he backed out of the proposal.[1] [3]
The vote was ultimately a failure, with O'Brien winning the ballot 22–9.[1] [3] Following the vote, Battin stood down his roles in the shadow cabinet;[1] [4] while Battin allies, and frontbench MPs, Nick Wakeling and Ryan Smith quit their roles.[5]
Following the spill attempt, former party leader and Opposition Leader, Matthew Guy, "insisted" he would not attempt to topple the leader before the next election in 2022, stating: “[it is] the end of the matter.”[6]
Labor Deputy Leader and Acting Premier James Merlino said in a press conference regarding the leadership vote: “They’re [Liberal Party] chaotic, they’re a rabble and they are irrelevant.” Further adding: “It just shows how irrelevant they are. We’re focused on getting people back to work...they’re focused on just one job, and protecting their own.”[1]
Former Liberal Premier Jeff Kennett said of the vote: “I don’t know where this came from I heard nothing about it[.] [It's] just politically naive, politically stupid, and it simply was brushed aside as it should have been.”[1]
On 7 September, after substantial indications that a spill motion would be put forward at a party meeting, including two key resignations the day prior (Matthew Guy, Tim Smith),[7] [8] Tim Smith, staunch ally of former leader Matthew Guy, moved for a leadership spill motion against incumbent Michael O'Brien.[9] With Guy heavily favoured to return as leader,[10] Michael O'Brien lost his mandate as leader in a leadership spill motion, 20–11;[11] just over six months from the previous spill motion attempt.
The same day, after the vacancy of the leadership, Matthew Guy was elected unopposed as the new leader of the party.[11] [12] Several days later, Guy revealed his new shadow cabinet, dropping MPs whom voted against the leadership spill motion.[13]