Narrow-band ultraviolet B (UVB) is a newer treatment modality for photoresponsive skin diseases. Since its introduction, dermatologists continue to use it for a myriad of dermatoses. Polycythemia vera is one cause of intractable pruritus that has recently been treated successfully with narrow-band UVB. We describe the case of a 77-year-old Caucasian male with a 4-year history of polycythemia vera complicated by intractable pruritus. Narrow-band UVB was successfully used to treat his pruritus. The patient noted an improvement in pruritus within the first four treatments and almost complete resolution after 18 treatments.