竹节虫，又称䗛（音同「修」）是节肢动物门昆虫纲竹节虫目（又称䗛）的总称。草食性的昆虫，以善于拟态成树枝或树叶著称，可以躲过天敌。全世界约有2,500种。

大型或非常大型的昆虫，体型修长，呈圆筒形，棒状或枝状；少数种类扁平如叶。复眼发达，单眼通常退化。翅膀通常退化；如有翅膀，前翅通常小于后翅。不完全变态，陆栖，植食性昆虫。多数分布于热带。

竹节虫目包括了全世界最长的昆虫-尖刺足刺竹节虫 (Pharnacia serratipes，分布于马来半岛)，体长(含脚)可达55.5公分。

竹节虫与螳螂有近亲关系。

The Phasmatodea (also known as Phasmida or Phasmatoptera) are an order of insects, whose members are variously known as stick insects (in Europe and Australasia), stick-bugs or walking sticks (in the United States and Canada), phasmids, ghost insects and leaf insects (generally the family Phylliidae). The group's name is derived from the Ancient Greek φάσμα phasma, meaning an apparition or phantom, referring to the resemblance of many species to sticks or leaves. Their natural camouflage makes them difficult for predators to detect, but many species have a secondary line of defence in the form of startle displays, spines or toxic secretions. The genus Phobaeticus includes the world's longest insects.