This study investigated the causal linkage between information and communication technologies (ICT) and sustainable development (environmental-CO 2 , economic-RGDP, and social-HDI) in the ECOWAS subregion categorized into low-income and lower-middle-income countries for the period 1995-2020. Cointegrating regression and causality methods were employed to estimate the dynamic linkage among variables in panel fully modified ordinary least squares (PFMOLS) and Dumitrescu-Hurlin causality models. The results of the study support the environmental Kuznets curve (EKC) hypothesis for low-income countries while it rejects EKC for lower-middleincome countries. The study recommends policy formulations targeted at incentivizing the use of environmentally friendly technologies that minimizes positive impact on the environment and enhance sustainable development.