This research paper assesses the impact of ICTs (which includes the Internet, mobile phone, pager, personal computer, and telephone) on Gross National Income (GNI) per capita in developing countries in 2005. It found a significant relationship between GNI per capita (in PPP international dollar) and adoption of each ICT (mobile phone, personal computer, and telephone) but not for Internet technology adoption. In addition, it identifies factors that developing countries need to consider in the adoption and application of ICTs for economic development.