The first formation was sworn in by the Governor of South Australia on 19 March 2018, when Marshall held all portfolios except Deputy Premier and Attorney-General, held by Vickie Chapman; and Treasurer, held by Rob Lucas. A rearrangement of the ministry took effect from 22 March 2018 when Marshall assigned most of his portfolio to other member of the government.
|Party||Minister||Portfolio||Term start||Term end||Term in office|
|Liberal||Hon. Steven Marshall MHA||19 March 2018||incumbent||463 days|
|Liberal||Hon. Vickie Chapman MHA|
|Liberal||Hon. Rob Lucas MLC|
|Liberal||Hon. John Gardner MHA||
||22 March 2018||460 days|
|Liberal||Hon. David Ridgway MLC||
|Liberal||Hon. Michelle Lensink MLC||
|Liberal||Hon. David Pisoni MHA||
|Liberal||Hon. Stephen Wade MLC||
|Liberal||Hon. Dan van Holst Pellekaan MHA||
|Liberal||Hon. Rachel Sanderson MHA||
|Liberal||Hon. Tim Whetstone MHA||
|Liberal||Hon. Corey Wingard MHA||
|Liberal||Hon. David Speirs MHA||
|Liberal||Hon. Stephan Knoll MHA||
- Liberals claim victory as Labor's Jay Weatherill concedes ABC News 17 March 2018
- "The South Australian Government Gazette, 19 March 2018, No. 18, Supplementary Gazette" (PDF). Retrieved 19 March 2018.
- MacLennan, Leah (22 March 2018). "SA election: Who's who in the new South Australian Liberal Government?". ABC News. Australia. Retrieved 22 March 2018.
- "The South Australian Government Gazette, 22 March 2018, No. 20, Supplementary Gazette" (PDF). Retrieved 23 March 2018.