That's according to data collated by The Iona Institute, an organisation dedicated to promoting Christianity.
It gathered data from 23 of the 26 Catholic dioceses on the island of Ireland.
The institute found that, over the past ten years, the number of baptisms taking place annually nationwide has fallen by 30 per cent.
The Diocese of Kerry recorded 1,775 baptisms in 2015, but this figure dropped by almost 400 (395) to 1,380 last year.
It’s important to note that the Diocese of Kerry also includes parishes in County Cork on the Beara Peninsula (Adrigole, Allihies, Castletownbere, and Eyeries) and in Duhallow (Ballydesmond, Boherbue, Dromtariffe, and Millstreet).
The Diocese of Meath experienced the most severe decrease, with a 40 per cent (40%) drop in baptisms.
Dublin followed, with a decrease of 39.9 per cent (39.9%).
The Dioceses of Achonry and Elphin in the North West sustained the smallest decrease over the ten-year period, dropping by just 0.9 per cent.
The chairman of The Iona Institute, Dr Tom Finegan, said that, given "that births have fallen by almost a fifth in the last ten years, and more people are ticking the ‘No Religion’ box in the census, [they] could expect nothing but a big drop in baptism figures”.
He also stated that “The figures … show that ‘cultural Catholicism’ remains strong on the island", with people identifying as Catholic but not being regular mass-goers.
Dr Finegan concluded that the fall in baptisms must be seen not simply as the result of secularisation, but even more as a result of falling births, adding that this should be of concern to everyone, regardless of religious belief.