<span lang="bn" dir="ltr">Cheng</span> Tsz Sum (; born 20 March 1999) is a Hong Kong professional footballer who currently plays as a left back or a left midfielder for Hong Kong Premier League club Rangers, on loan from Tai Po.
On 5 August 2017, Cheng was unveiled as part of Lee Man's inaugural squad.
On 31 July 2018, Cheng was named as one of Tai Po's summer signings.
On 1 July 2020, Eastern announced that Cheng would join the club.
On 6 September 2021, Cheng rejoined Rangers.
On 8 August 2022, Cheng returned to Tai Po.
On 29 July 2025, Cheng joined Rangers on loan for the 2025âÂÂ26 season.