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The Ha'penny Bridge, known later for a time as the Penny Ha'penny Bridge, and officially the Liffey Bridge, is a pedestrian bridge built in May 1816 over the River Liffey in Dublin, Ireland. Made of cast iron, the bridge was cast in Shropshire, England.

The River Liffey flows through the centre of Dublin. Its major tributaries include the River Dodder, the River Poddle and the River Camac. The river supplies much of Dublin's water and a range of recreational activities. It rises in The Wicklow Mountains and flows 125km.