The Turnbull government was the federal executive government of Australia led by the 29th prime minister of Australia, Malcolm Turnbull, from 2015 to 2018. It succeeded the Abbott government, which brought the Coalition to power at the 2013 Australian federal election. The government consisted of members of Australia's Liberal-Nationals Coalition. Turnbull took office by challenging his leader, Tony Abbott, in an internal leadership ballot. Warren Truss, the leader of the Nationals, served as deputy prime minister until he retired in 2016 and was replaced by Barnaby Joyce. Joyce resigned in February 2018 and the Nationals' new leader Michael McCormack became deputy prime minister. The Turnbull government concluded with Turnbull's resignation ahead of internal leadership ballot which saw him succeeded as prime minister by Scott Morrison and the Morrison government.

In mounting his 2015 public challenge for the leadership, Turnbull cited extended poor polling in Newspoll by the Abbott government and said Australia needed a new style of "economic leadership". Turnbull appointed Morrison as Treasurer in an expanded ministry, promoting several key supporters. Julie Bishop remained as Minister for Foreign Affairs. Conservatives Tony Abbott, Eric Abetz and Kevin Andrews were sent to the backbench. Joe Hockey left Parliament. The Turnbull government continued a number of Abbott government initiatives, promising a plebiscite legalising same-sex marriage, concluding Abbott era initiatives on an anti-domestic violence campaign, funding the National Disability Insurance Scheme, signing a China free trade deal, and reforming Senate voting.

The April 2016 refusal of the Senate to pass the government's bill to re-establish a watchdog for the construction industry provided Turnbull with a double dissolution trigger. An election was held on 2 July, and the government was returned with its majority in the House of Representatives reduced to one seat. The 2016 election saw a resurgence of the right wing Pauline Hanson's One Nation Party, and discontented conservative Liberal Senator Cory Bernardi left the party and established the Australian Conservatives soon after. The now elected Turnbull government secured passage of the Registered Organisations and Australian Building and Construction Commission legislation. In 2017, it announced Federal funds for expansion of Snowy Hydro. In June 2017, it introduced the "Gonski 2.0" reforms to schools funding. Factional strains continued.

Turnbull's ousting of Abbott had divided the Liberal Party rank and file and tensions continued in the parliamentary Party. Abbott said Turnbull supporters had plotted against him. The government reached the 30-consecutive-Newspoll-losses benchmark Turnbull had used to unseat Abbott, in April 2018. The Parliament faced a period of instability under the 2017–18 Australian parliamentary eligibility crisis, and the Turnbull government briefly lost its parliamentary majority and Deputy Prime Minister Joyce. Joyce was re-elected, but in February 2018 Turnbull denounced him and forced his resignation after the press reported on an office affair he had been conducting with a staffer. By-election losses in July 2018 further diminished Turnbull's authority. Dissent from conservative MPs over issues such as energy prices and immigration levels grew during Turnbull's final months. On 21 August, Turnbull announced a leadership spill ahead of his 39th consecutive Newspoll loss, which he narrowly won against Peter Dutton. Turnbull resigned three days later after narrowly losing the confidence of his Party room. Turnbull blamed Abbott, Dutton and conservative media commentators.

Malcolm Turnbull entered Parliament as the Member for Wentworth in 2004, and went on to serve as Parliamentary Secretary to the Prime Minister from January 2006, and later Minister for the Environment and Water Resources in the Liberal-National coalition led by Prime Minister John Howard. Before entering Parliament, Turnbull had previously worked as a journalist, a barrister and a merchant banker. He also headed the Australian Republican Movement, and had been active in the failed "Yes" campaign for the 1999 republic referendum.

The Howard government was defeated at the 2007 federal election by the Australian Labor Party led by Kevin Rudd. In the aftermath, Turnbull entered and lost in the ensuing ballot for the Liberal Party leadership, which was won by Brendan Nelson. Turnbull served as Shadow Treasurer, before toppling Nelson in the November 2008 Liberal leadership spill.

The Godwin Grech Affair undermined Turnbull's authority, and amid extended poor polling, and disagreement within the Coalition over Turnbull's support for the Rudd government's climate change taxation policies, Turnbull was replaced as leader of the Liberals by Tony Abbott following a 2009 leadership spill. The Coalition's position in the polls was improved by the leadership change, and Abbott went on to lead the Coalition to the 2010 federal election (which resulted in a hung parliament) and to win the 2013 federal election, returning to power after six years in opposition. Turnbull served as Minister for Communications in the Abbott government, and oversaw the National Broadband rollout.

The Abbott government delivered its election promises of removing industry taxes on mining and carbon emissions, and halting unauthorised boat arrivals, but its first Budget's expenditure cuts and surprise revenue proposals met with a hostile reception in the Senate and media. Monarchist Abbott's decision to knight the Duke of Edinburgh brought heavy media criticism, and amid declining poll numbers for the Coalition, rumours of an intention by republican Malcolm Turnbull to challenge for the leadership continued. On 5 February, Fairfax reported that leadership speculation was at "fever pitch" after backbench Senator Arthur Sinodinos (a demoted-Minister) questioned Abbott's judgement on Sky News and refused to confirm if the Prime Minister would still hold his job in a week's time. The following day, the ABC's 7.30 reported that "The tensions between the Prime Minister and the colleagues campaigning to oust him are heading to a showdown."