Welcome to the O'Sullivan Clan

O’Sullivan Family Motto – The Steady Hand to Victory

Join the Clan

Join and Support the O'Sullivan Clan and Help Keep us Online

Join the O'Sullivan Clan

Join the O'Sullivan Clan

Join the O’Sullivan Irish Clan today and get your free O’Sullivan Clan Certificate. Membership is free and always will be it’s your birthright!
Maureen O'Sullivan

Famous People

The O’Sullivan Irish Clan has had it fair share of famous members over the years. Have a read through some of our more famous members and their achievements.
O'Sullivan Homelands Kerry


It was predominantly in the South-West of Ireland that the O’Sullivan Irish Clan will find their ancestral homeland area.

O'Sullivan Clan Shop

Please help keep the O’Sullivan Irish Clan online by purchasing some clan merchandise. O’Sullivan Clans is an independent project made possible by the Irish Clans Network Initiative.

Official Clan Certificate

Please contact us with the name you wish to register on your certificate. We will print out and post you your certificate for a small fee.