Dibbs was elected to the New South Wales Legislative Assembly in 1874 and served as Premier on three occasions. The title of Premier was widely used to refer to the Leader of Government, but was not a formal position in the government until 1920. Instead the Premier was appointed to another portfolio, usually Colonial Secretary. Dibbs took over as Premier on the first occasion in October 1885 following the resignation of Alexander Stuart due to ill-health, with his ministry lasting for 75 days. This was a period of great financial stress for the colony. Dibbs served as colonial secretary in the Jennings ministry, before it too suffered budgetary pressures. It was during this time that the party system was formed in New South Wales with Dibbs aligning himself with the Protectionist Party. His second term as premier lasted for just 49 days.[2][3][4]
Federation was an emerging issue, with Dibbs supporting an initial customs union, but was a severe critic of the strong federalism promoted by Parkes and Barton.[2] Despite their disagreement on federalism, Barton agreed to be Attorney General, based on an agreement that Barton was free to promote federalism and Dibbs would not obstruct discussion on federation in the Legislative Assembly.[5]
Dibbs visited London in 1892 and during his absence Edmund Barton was acting Premier,[5] while Francis Suttor was acting Colonial Secretary.[8] In January 1893 Sir Julian Salomons resigned from the ministry because he disagreed with several points of government policy.[9]
Barton and Richard O'Connor, the Minister of Justice had been representing the plaintiff in the case of Proudfoot v the Railway Commissioners before taking office and retained the brief as they had the right to carry out private practice as barristers. Two years later the case still had not been resolved and in November 1893 they were questioned in parliament about whether it was proper for ministers to act against a government department. Barton and O'Connor returned the brief however Barton argued that the Railway Commissioners were not a government department and were not conducting their business through the Crown Law Office such that the ministers had the right in their professional practice, to appear against them in court.[5][10] The government lost an adjournment motion on this point by 69 to 48 and both Barton and O'Connor resigned from the ministry.[11]Charles Heydon was appointed Attorney General while Thomas Slattery was appointed Minister of Justice in addition to his duties as Secretary for Mines and Agriculture.
Dibbs treated the adjournment as a vote of censure, and persuaded Governor Robert Duff to prorogue parliament.[11] The Legislative Assembly resumed in January until it was dissolved on 25 June 1894, and a general election was held on 27 July 1894, at which Dibb failed to carry the vote. Although he had lost control of the Assembly, Dibbs said he would not resign until after parliament had reconvened, but the Governor forced his hand. Dibbs sought the appointment of several persons by the Governor to the then fully appointed Legislative Council, which Duff refused to do, on the ground that the ministry had been condemned by the colony. In consequence, Dibbs and the ministers resigned on 2 August 1894.[2][8]
The third Dibbs ministry was followed by the Reid ministry, led by George Reid, who had replaced Parkes as leader of the Free Trade Party.[12][8] The new parliament opened on 7 August 1894.