This paper examines the role of the IT Services Provider (ITSP) in facilitating adoption of sustainable IT and IT management practices in client organizations Informed by resource dependency and inter-organizational knowledge transfer perspectives and based on primary data from five large ITSPs from India, it shows that ITSPs can influence adoption of IT sustainability in client organizations by delivering the Sustainable IT Services Value Chain, providing access to sustainability-related expertise, and exemplifying their own sustainability initiatives as illustrations. The outcome of such action is to enhance client organizations’ performance and cognizance relating to sustainable IT. The paper furthers the sustainable IT literature by introducing the hitherto lacking ITSP’s perspective on sustainable IT.