There are three major ferry companies that operate to and from Ireland:

Irish Ferries operate services from Dublin City to Holyhead (UK), Rosslare to Pembroke (UK), and from Rosslare to Cherbourg and Roscoff (France).

Stena Line operate services from Dun Laoghaire (Dublin) to Holyhead (UK), from Rosslare to Fishguard (UK), from Belfast to Stranraer (Scotland), and from Larne to Fleetwood (UK).

Brittany Ferries operate services from Cork to Roscoff (France).

Other Ferry companies that also serve Ireland are:
Norfolk Line - www.norfolkline.com
P&O Ferries - www.poferries.com
The Isle of Man Steam Packet Company - www.steam-packet.com
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