The 2018 Singapore Cup (also known as the RHB Singapore Cup for sponsorship reasons) is the 21st edition of Singapore's annual premier club football knock-out tournament organised by the Football Association of Singapore.

Balestier Khalsa won 1–0 on aggregate.

Albirex Niigata won 3–0 on aggregate.

Home United won 4–3 on aggregate.

Albirex Niigata won 4–2 on aggregate.