In geometry, the elongated pentagonal orthobicupola or cantellated pentagonal prism is one of the Johnson solids (J_38). As the name suggests, it can be constructed by elongating a pentagonal orthobicupola (J_30) by inserting a decagonal prism between its two congruent halves. Rotating one of the cupolae through 36 degrees before inserting the prism yields an elongated pentagonal gyrobicupola (J_39).