Mohammad Helmi bin Haji Zambin is a Bruneian footballer who plays as a right-sided full-back or midfielder for Kasuka FC of the Brunei Super League.

[9] Helmi subsequently signed for Kasuka FC who gained entry to the preliminary stage of the 2024–25 Shopee Cup as Bruneian league champions.

He made his debut on 24 July 2024 as a substitute in the play-offs second leg against Shan United of Myanmar where the Bruneian club succumbed to a 3–1 defeat.

Helmi was a late addition to the Brunei national team squad for the 2016 AFC Solidarity Cup held in Kuching, Malaysia.

Helmi's consistent club form led to an international callup for the 2018 AFF Suzuki Cup qualification matches against Timor-Leste in early September.

[21] Helmi accepted another callup in June 2019 for the two-legged 2022 World Cup qualification matches against Mongolia, despite several of his teammates pulling out at late notice.