The family Theridiidae (Sundevall, 1833) comprises over 2,200 species of ecribellate spiders worldwide, of which many have synanthropic affinities. It has been estimated that Theridiidae spiders are the most diverse non-native spiders in Europe, with 13 alien species having successfully established colonies across the continent between 1850 and 2000 (Kobelt and Nentwig 2008). Within the family Theridiidae, several species of synanthropic false widows (genus Steatoda Sundevall, 1833) have recently expanded their range across most of Europe and beyond (Nedvěd et al. 2011, Nyffeler 1986, Dugon et al. 2017). Members of the genus Steatoda have been involved in envenomations in Ireland (Dunbar et al. 2017), Britain (Warrell et al. 1991, Dunbar et al. 2017), France (Pommier et al. 2006), Chile (Faúndez and Téllez 2016) and Australia (Isbister and Gray 2003). Additionally, Steatoda may compete with, predate on, and displace native species of spiders (Nyffeler 1986, Hann 1990, Kulczycki 2012, Dugon et al. 2017). It is therefore essential to monitor range expansion by Steatoda species. Here we provide new records for four Steatoda species: a new Irish record for Steatoda triangulosa (Walckenaer, 1802), a new county record for Steatoda nobilis (Thorell, 1875), Steatoda bipunctata (Linnaeus, 1758) and two new county records for Steatoda grossa (Koch, 1838). All specimens were identified using Roberts (1995).