Phobaeticus kirbyi is species of stick insect native to Borneo. It is one of the world's longest insects. The holotype deposited at the Natural History Museum in London measures 32.8 cm (12.9 in) in body length and 54.6 cm (21.5 in) total length, including extended legs. This makes it the third-longest known insect in terms of body length, behind the stick insects Phryganistria "chinensis" with 36.1 cm (14.2 in) and Phobaeticus chani with 35.7 cm (14.1 in). P. "chinensis", P. chani, P. serratipes and Ctenomorpha gargantua exceed it in total length with legs extended. Recent specimens of P. kirbyi have only reached 28.3 cm (11.1 in) in body length.