Alexander Joseph Gersbach (/ˈɡɜːrzbæk/ GURZ-bak;[2] born 8 May 1997) is an Australian professional soccer player who plays as a left-back for A-League club Western Sydney Wanderers, and the Australia national team.

[11] In July 2019, Gersbach moved to Denmark and joined AGF on a 3-year contract, also getting reunited with his former teammate from the national team Mustafa Amini.

[13] After playing two seasons for Grenoble, Gersbach joined Major League Soccer team Colorado Rapids on 30 January 2023 for a reported fee of €300.000.

[4] On 15 January 2025, it was announced that Gersbach had returned to Australia, signing for the Western Sydney Wanderers on a two and a half year deal.

On 4 June 2016, Gersbach made his first international appearance for Australia, coming on for Brad Smith against Greece in the 82nd minute and later setting up Mathew Leckie's last second winner.