This article covers the whole of Ireland, that is, covering both the Republic of Ireland and Northern Ireland

Navigable canals

• Ardnacrusha Canal
• Grand Canal
• Jamestown Canal
• Lecarrow Canal
• Newry Ship Canal
• Royal Canal
• Shannon–Erne Waterway
• Tralee Ship Canal

Derelict canals

• Athlone Canal
• Ballinasloe Canal
• Boyne Navigation
• Bridgetown Canal
• Broharris Canal
• Coalisland Canal (Tyrone Navigation)
• Cong Canal (Dry Canal)
• Dukart's Canal
• Eglinton Canal
• Lacy's Canal
• Lismore Canal
• Kilkenny Canal
• Killaloe Canal & Plassey–Errina Canal
• Lagan Canal (Lagan Navigation)
• Newry Canal
• Park Canal
• Strabane Canal
• Ulster Canal

Filled-in branches or spurs

• Grand Canal Harbour (near St. James's Gate) branch, Dublin
• Royal Canal branch to Constitution Hill harbour, Dublin (aka the Broadstone line)