The African bollworm (Helicorvepa armigera) and whiteflies (Bemisia tabaci) are pests of economic importance in Zimbabwe. H. armigera destroys half a dozen squares, bolls or more during its lifetime, while B. tabaci stains and downgrade cotton lint with honey dew. A study to evaluate the effect of intercropping cotton (Gossypium hirsutum L.) and cowpea (Vigna unguiculata) L. Walp., on populations of the African bollworm and whiteflies was conducted in the 2012/2013 season at Cotton Research Institute of Kadoma, in Zimbabwe. Cowpea variety CBC3 was intercropped with cotton variety CRI MS2 using intercrop ratios of cotton-cowpea of 1:1, 2:1, and 2:2 with sprayed and unsprayed treatment for each ratio. Other treatments were the control treatment and Control of African boll worms and white flies with Lambda-cyhalothrin 5EC and Acetamiprid 20SP. A Randomized Complete Block Design (RCBD) with eight treatments replicated four times was used in the study. Data on H. armigera larval counts and B. tabaci adults on 24 cotton plants per treatment was collected. Data analysis was done using Genstat 14th Edition of 2011. Inter-cropping cotton and cowpea using a ratio of 2:1 reduced H. armigera and B. tabaci populations by 45.5% and 90% in UN-sprayed treatments, while in sprayed crop H. armigera and B. tabaci populations were reduced by 69.7% and 80% respectively. Both the sprayed and UN-sprayed inter-crop ratio of 2:1 resulted in the least populations of the African boll worm and white fly.