An alien species (IAS) is an exotic species that establishes itself in ecosystems or habitats that are natural or partially natural. It is a force for change and endangers the biological diversity of the environment. Invasive insects in India have posed a serious threat to the environment, agricultural products, human health, and domestic goods. Since India's weather and environment are so diverse, numerous introduced insects from other parts of the world can flourish there. Furthermore, the introduction of invasive insect pests has been made easier by globalisation. There have so far been 23 reports of invading alien insects coming from India. This chapter focuses solely on the traits of invasive insects, common entry points for invasive insects, the processes by which the introduced insect has established itself in the foreign territory, and management strategies.