Well preserved, toothed, pinnate leaves have been collected from the Upper Jurassic Tochikubo Formation, northeast Japan. This plant has been interpreted as a new species of Encephalartites, which was established by Vachrameev in 1962 for a plant from the Lower Cretaceous. Specimens recently collected from the Jurassic of Fukushima Prefecture, Japan, provide us with new morphological information about this genus. Leaflets are attached to the adaxial surface of the rachis. The base of the leaflet is symmetrical and its proximal portion narrows to the attachment area. Unfortunately the cuticle is not preserved and therefore the suprageneric taxonomic position is uncertain. The authors propose a new species of this genus, Encephalartites nipponensis sp. nov.