The O'Farrell ministry was the 93rd ministry of the Government of New South Wales, and was led by Barry O'Farrell, the state's 43rd Premier.

The Liberal–National coalition ministry was formed following the defeat of the Keneally-led Labor government at the 2011 election. It was the first coalition ministry since the Greiner-Fahey-led coalition ministries of the late 1980s and early 1990s.

The ministry was sworn in on 3 April 2011 at Government House by the Lieutenant Governor, James Spigelman.^[1] A few days earlier, on 28 March 2011, O'Farrell and Nationals leader Andrew Stoner were sworn in by Governor Marie Bashir, as Premier and Deputy Premier respectively at a ceremony held in the office of the Chief Secretary of New South Wales.^[2] Although the Coalition's landslide victory was beyond doubt, counting was still underway in a few seats. With this in mind, O'Farrell had himself and Stoner sworn in as an interim two-man government until a full ministry could be sworn in.^[3]

On 16 April 2014, O'Farrell announced his intention to resign as Premier and as Leader of the Liberal Party, leading to the end of his government.^[4] The following day, Mike Baird was elected as Leader of the Liberal Party and he formed the Baird ministry which was sworn in on 23 April 2014.^[5][6][7]

This arrangement covers the period from 28 March 2011 until 1 August 2013, when Greg Pearce was dismissed from Cabinet and the ministry after an investigation revealed that he failed to disclose a conflict of interest when making an appointment to the board of Sydney Water.^[8]

Following the dismissal of Greg Pearce from cabinet and the ministry on 1 August 2013, Andrew Constance assumed the responsibilities as Minister for Finance and Services. John Ajaka assumed Constance's former responsibilities as Minister for Disability Services and Pearce's former responsibilities as Minister for the Illawarra.^[8] Only changes in ministerial portfolio are shown.

Following the resignation of Graham Annesley from cabinet and the parliament on 28 August 2013, Gabrielle Upton assumed the responsibilities as Minister for Sport and Recreation, sworn in on 30 August.^[9]

Following the resignation of Chris Hartcher from cabinet 4 December 2013, Fair Trading Minister Anthony Roberts assumed his responsibilities as Minister for Resources and Energy and Special Minister of State. The Leader of the Government in the Legislative Council Mike Gallacher assumed Hartcher's other portfolio as Minister for the Central Coast. Penrith MP Stuart Ayres was also appointed to succeed Roberts in his Fair Trading portfolio.^[10] This final arrangement continued until the ministry was dissolved on 23 April 2014 and succeeded by the Baird ministry.