T. insignis may refer to: * Tetraceratops insignis, a lizard-like synapsid species that lived during the Early Permian period * Thamnochortus insignis, a grass-like restio species found in Africa * Thamnophilus insignis, the streak-backed antshrike, a bird species found in Brazil, Guyana and Venezuela * , a crane fly species in the genus Thaumastoptera * Thyreus insignis, a bee species in the genus Thyreus * , a scorpion species in the genus Tityus * Tonicella insignis, a chiton species in the genus Tonicella * Torellia insignis, a sea snail species * Trachelyopterus insignis, a species of catfish * , an alga species in the genus Trochisciopsis