Tullow (/ˈtʊloʊ/; Irish: An Tulach, meaning 'the hillock', formerly Tulach Ó bhFéidhlim/ Tullowphelim) is a market town in County Carlow, Ireland. It is located on the River Slaney where the N81 road intersects with the R725. As of 2016, the population was 4,673.