Western United FC

In August 2018, the Western Melbourne Group was one of the eight teams that the FFA had accepted in the official bidding phase, as part of the new expansion process. Four months later, the bid's success was announced, along with the bid from Macarthur FC. Western Melbourne will play its home games at Kardinia Park in Geelong for its first two seasons, while it builds its stadium and training centre in Tarneit, with completion expected in 2021.

On 11 January 2019, Western Melbourne Group announced John Anastasiadis as senior assistant coach for the club's debut season. On 24 January 2019, the consortium announced that John Hutchinson would also join the club as an assistant coach.

On 31 January 2019, Western Melbourne made its first player and marquee signing Panagiotis Kone ahead of its inaugural season. On 12 February 2019, Socceroos defender Josh Risdon became Western Melbourne's first Australian signing.

On 13 February 2019, it was announced that the club would be called Western United Football Club after a public vote was held through the Herald Sun newspaper. The club's colours of green and black were also chosen via the same public vote.

In May 2019, Western United announced partnership with sports brand Kappa. Two months later, the club unveiled their inaugural jerseys for their first season in the A-League, featuring green and black stripes.

On 2 June 2019 the Director of Football for Western United, Steve Horvat presented Geelong representative players with their kits for the 2019 Country Championships. Horvat additionally announced the club would set up a Geelong-based academy by 2021.

On 28 May 2022 they became A-League champions, defeating defending champions Melbourne City in the 2022 A-League Men Grand Final. Their Grand Final win saw Western United became just the second expansion side ever to win the A-League Championship, the quickest expansion side to win the championship, the first team since to triumph in their first grand final appearance since Brisbane Roar in 2011, and one of just two teams to have won the championship after finishing outside the top two, with Melbourne Victory first achieving this feat in 2018.

The 2022-23 A-League season saw Western United become the first A-League champion in 6 years to fail to qualify for the A-League finals, with the club finishing the season in 7th place on 32 points, with a final tally of 9 wins,5 draws and 12 losses.

In October 2023, it was announced that Western United had been given approval from the Wyndham City Council to play home A-Leagues matches at their training ground, the Wyndham Regional Football Facility, in the 2023-24 A-League season, with the venue to serve as Western United's temporary home stadium until the Wyndham City Stadium is completed.

The 2023-24 A-League season started promisingly for Western United, with the club recording a 2-1 win over Melbourne City at AAMI Park. However, this was followed by a run of 6 consecutive losses, with this losing run halted with a 2-1 win over Brisbane Roar.

Western United Women also joined the A-League Women for the 2022–23 season, which, with the return of Central Coast Mariners, will expand that league to 12 teams.