Tullow, formerly known as Tullowphelim, is a market town located in County Carlow, Ireland. It is situated on the banks of the River Slaney at the point where the N81 road intersects with the R725.
As of 2022, the population of the town was 5,138. The name Tullowphelim also serves as the designation for both the townland and the civil parish in which Tullow is situated.