In geometry, the elongated pentagonal gyrobicupola is one of the Johnson solids (J_39). As the name suggests, it can be constructed by elongating a pentagonal gyrobicupola (J_31) by inserting a decagonal prism between its congruent halves. Rotating one of the pentagonal cupolae (J_5) through 36 degrees before inserting the prism yields an elongated pentagonal orthobicupola (J_38).