The true bugs are one of the most economically important insect pests in agro ecosystems. Several different pheromones for true bugs have been reported, including sex, attractant, aggregation and alarm pheromones. The term sex pheromone refers to a compound liberated by a female, with the dual purpose of both attracting the male from a distance. Sex pheromone of the hemiptera are largely produced by males. The sex attractant pheromones are typically volatile chemicals produced by either male or female members of species for successful courtship and mating. The aggregations pheromones are produced by either one or both sexes and serve to attract other individuals for feeding, mating and protection. Moreover, the alarm pheromones warn members of a species of impending danger and those are commonly easily disturbed and readily emit their offensive odor. In conclusion, important pheromones of the true bugs can be classified four different categories; sex, attractant, aggregation and alarm pheromones. The knowing them can be important key to monitor time of emergence of pest population, pest density, detection new pest species, decision of successful control program and using them as bait with insecitide trial.