The first government of Javier Lambán was formed on 6 July 2015, following the latter's election as President of the Government of Aragon by the Cortes of Aragon on 3 July and his swearing-in on 5 July, as a result of the Spanish Socialist Workers' Party (PSOE) and the Aragonese Union (CHA) being able to muster a majority of seats in the Cortes with external support from Podemos and United Left (IU) following the 2015 Aragonese regional election.

[1] It succeeded the government of Luisa Fernanda Rudi and was the Government of Aragon from 6 July 2015 to 6 August 2019, a total of 1,492 days, or 4 years and 1 month.

The cabinet comprised members of the PSOE and the CHA.

[2][3] It was automatically dismissed on 27 May 2019 as a consequence of the 2019 regional election, but remained in acting capacity until the next government was sworn in.

The Government of Aragon was structured into the office for the president and nine ministries.