Jacob Mahler (born 10 April 2000) is a professional footballer who plays either as a defensive midfielder or centre-back for Thai League 1 club Muangthong United.

[1] Mahler made his professional debut for Young Lions in a 1–3 Singapore Premier League lost to Geylang International on 4 July 2018.

[3] On 19 May 2023, Mahler joined Indonesia Liga 1 club, Madura United becoming the 10th Singaporean to play in the Indonesian top-flight league.

[4] On 23 July 2023, Mahler scored his first goal for the club against Persis Solo coming from a set piece cross from Francisco Rivera.

[13] Mahler is a big fan of Manchester United and had cited that he used to emulate the playing style of his favourite player, Paul Scholes.