Irish Coast Guard volunteer Caitriona Lucas will be among those honoured at a ceremony today.
Every year the Dun Laoghaire RNLI remembers those who have lost their lives on the water - including their 15 members who died during a search on Christmas Eve in 1895.
Two wreaths are usually laid at sea but this year a third wreath will be added in memory of Caitriona.
David Branigan from Dun Laoghaire RNLI explains why they wanted to pay special tribute to her:
