The prize is the largest monetary prize for a collection by an Irish poet, with the winner receiving €12,000 and the two other finalists receiving €1000.
The three collections are Collected Poems by Eiléan Ní Chuilleanáin, Found Architecture - Selected Poems by Sinéad Morrissey and Ourselves by Beda Higgins.
Speaking about the adjudication, Poet Maura Dooley said: "Transported, educated, made to see the world differently; we were delighted to discover many fresh and exciting new voices in amongst new books from already familiar and beloved poets. It was a very difficult task to choose just three books from such a rich field."
The winner will be announced on the opening night of Listowel Writers Week, on June 2nd, 2021.