 The Irish food portion sizes database contains median, 25th and 75th percentile portion weights for a variety of foods and beverages for Irish children, adolescents and adults. The data were collected from three large, cross-sectional food consumption surveys conducted in Ireland between 2003 and 2010. The data can be used to estimate typical portion sizes for various foods and beverages, and can also be used to compare portion sizes among different demographic groups. This article was authored by Jacqueline Lyons, Janet Walton, and Albert Flynn.