Linear psoriasis is a rare form of psoriasis and is characterized by the linear distribution of the psoriatic lesions. It should be differentiated clinically and histopathologically from inflammatory linear verrucous epidermal nevus(ILVEN) or psoriasis occuring as part of the Koebner phenomenon. A 41-year-old female is described, who had developed linearly arranged psoriatic lesions in the right lower extremity over the last 10 years. Not only pathological and immunohistochemical studies but also the clinical response to therapies reveal that this is the first case of linear psoriasis in Korea. (Kor J Derm~atol 1996;34(6): 998-1002)