Its home games are played at the 9000-capacity Marconi Stadium in the suburb of Bossley Park in Sydney's west; a venue known affectionately by players and fans as the Palace.

Throughout the club's history, it has been an institution of the Italian community in Sydney, and its playing colours have varied between a light blue azzurro strip in homage to the Italy national football team and a combination of green shirt, white shorts, red socks, representing the colours of the Italian flag.

It is named after the Italian inventor and electrical engineer Guglielmo Marconi, whose wireless company sent the first direct radio message from Great Britain to Australia.

It was inaugural president Oscar Michelini who first suggested the name Marconi at the second meeting of the club's provisional committee.

It incorporates a globe, a boomerang to symbolise Indigenous Australian culture, with the colours of green, white and red to represent the Italian heritage.

[8] The club's home base in Bossley Park, next to where Marconi Stadium now stands, was offered for $6900 by the brothers Ruben and Provino Sartor, two inaugural members who had visited the Yoogali Club in the rural town of Griffith, New South Wales to learn how the Italian community there had founded their own social organisation.

[9] The soccer club first appeared in 1958 as a youth team, and the first senior side competed in the 1961 NSW amateur championship that it won by 8 points.

Ahead of the 1981 National Soccer League season, Marconi signed a sponsorship deal with car manufacturer Datsun under which the club were known as Marconi-Datsun Leopards.

In 1995–96 under former Socceroo Manfred Schaefer, Marconi won another Minor Premiership, finishing one point ahead of Melbourne Knights and Sydney Olympic.

[14] After a third placed league finish, Marconi beat Sydney Olympic 2–0 in the Qualifying Final, then lost to Bonnyrigg White Eagles FC 2–0 in the Major Semi-Final.

[16] The Stallions began their rebuilding campaign in October 2015 with the aim of getting straight back in the top state division.

[21] Marconi finished the NPL 2 season in 4th place, failing to achieve its target of promotion, despite Rooney, Pavlovic and Jesic scoring 51 goals between them.

[27] The club was announced on 20 November 2023, as one of the eight foundation teams for the National Second Division, due to start either March or April 2025.

[28] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.