Following research on the signi cance of employees' behaviors in a rm's environmental initiatives, this study explores the motivational factors that in uence information technology (IT) professionals' proenvironmental behaviors (PEBs). Based on the self-determination theory (SDT), autonomous and controlled motivations were posited as determinants of PEBs, and the green human resource management (GHRM) literature was integrated to examine the direct and indirect effects of GHRM practices. The hypothesized model was tested using data collected from 333 IT professionals in Malaysia. The results supported the view that autonomous motivation and GHRM practices have signi cant effects on PEBs. Furthermore, GHRM was a signi cant moderator of the effects of autonomous motivation on PEBs. On the contrary, the hypotheses that controlled motivation had a constraining effect, and GHRM has a moderating effect on PEBs were not supported. The present ndings demonstrate that IT professionals' PEBs are associated with environmental practices based on interest and value. Thus, this study extends the SDT by incorporating GHRM literature to deepen the understanding of the motivational factors of PEBs among a sample of IT professionals.