Green Information Technology (IT) is emerging as an increasingly important issue as organizations come under pressure to address environmental sustainability concerns. Despite increased attention from business, government and more recently, Information Systems (IS) researchers, a measure to determine the capability of organizations to Green their IT remains elusive. The purpose of this paper is to develop a Green IT Readiness (G-readiness) model, identify its key dimensions and develop a reliable and valid instrument to operationalize it. The validity of the proposed model is tested using structural equation modeling based on data collected from a cross-sectional and cross-country survey of Chief Information Officers and other IT managers. The study makes an original contribution to the IS literature in an area that is attracting increasing managerial attention yet lacking in research, that is, the interaction between IT and ecosustainability.