港湾式月台（Bay platform）是火车站月台的一种型态，通常用于一条铁路线的终点站。

列车驶进车站时会有如船舰般被凹形月台包夹在中间。这种月台常见于区域或长途客运铁路的终点站或折返式车站，列车必须以进站时的相反方向驶离月台。另外还有一种比港湾式月台为小，被称作码头式月台的型态，专为货运列车上下货物而设计。

In the UK and Australia, a bay platform is a dead-end railway platform at a railway station that has through lines. It is normal for bay platforms to be shorter than their associated through platforms.