House and apartment price growth fell for the fifth consecutive month in September, according to latest figures from the Central Statistics Office.
Annual growth of 8.2% in the year to September was the lowest level of growth since October 2016.
The slowdown in growth is concentrated in the most expensive areas of the country.
In Dublin, residential property prices increased by 5.8% in the year to September - which was the first time the growth rate in the capital fell below 6% in a year and a half.
Dublin house prices increased by 5.5%, while apartment prices were up by 7.8% in the same period.
The highest house price growth in the region was in Dún Laoghaire-Rathdown, at 8.3%, with the lowest growth in South Dublin, where house prices rose by 4.2%.
The CSO numbers also show property price growth outside of Dublin continues to outpace growth in the capital.
Prices outside of Dublin were 10.8% higher in the year to September.
The Mid-West region showed the greatest house price growth, at 21%, while the border region showed the least price growth, with house prices increasing by 5.8%. Apartment prices in the Rest of Ireland increased by 16.7% in the same period.
Despite the increases house and apartment prices across the country are still around a fifth below their 2007 peak, and since the property market bottomed out in early 2013 prices nationally have risen by over 80%.
Dublin residential property prices have increased by 96.1% from their February 2012 low.