Greystones signed a Twinning Oath with Holyhead in Wales in 2012, based on both towns having similar populations, maritime traditions, and community clubs and activities.
The Mayor of Holyhead, Councillor Cadi Evanson and the Deputy Mayor. Councillor Adrienne Edwards, together with other members and officials from Holyhead Town Council and the Holyhead Twinning Committee, travelled to Greystones in November 2025 for the switch on of the Christmas lights. They were accompanied by Santa Clause in his magnificent Santa House and Sleigh, Mr. Snowman and two elves. They participated in a wonderful parade through the town and were greeted by many children and their parents/guardians along the route.
The Holyhead Male Voice Choir also travelled to Greystones with the group and performed in Burnaby Park at the Christmas Lights event. Earlier in the day, following a local tour guided by Mr. Ciaran Hayden, the choir members met with Rev. Natasha Quinn Doyle, Rector at Christ Church Delgany (who is from Wales) and they performed in the church there.
A meeting room in the Civic Offices in Greystones has been designated as the 'Holyhead Room' and this was officially named, and ribbons cut simultaneously, by Councillor Lourda Scott, Cathaoirleach of Greystones Municipal District and Councillor Cadi Evanson, Mayor of Holyhead Town Council. Light refreshments were provided for the visitors following this naming.
A number of groups and individuals have visited Greystones from Holyhead and return visits have taken place. Representatives from Holyhead Sea Cadets, Holyhead Round Table, Maritime Museum and Holyhead Hotspurs FC are regular participants in the annual St. Patrick's Day Parade in Greystones.
Greystones was represented in its twinned town of Holyhead for St. David’s Day in early March 2019. Inspired by twinning visits to Greystones for the St. Patrick’s day parade the Holyhead twinning committee have been organising local events to mark St David’s Day which includes a parade of local school children.
Old friendships are constantly renewed and new friendships made during twinning visits which provide an opportunity to discuss future twinning events in both locations and to build on the many twinning connections between Holyhead and Greystones.
The boat 'Becky IV' was the first boat from Holyhead to sail into the new harbour in Greystones and has been a regular visitor since then. Many personal contacts have been established with visitors from Greystones attending the Old Gaffers Traditional Sailing Festival in Holyhead each August.