Despite the existence of valuable literature on political and corporate corruption, there have been only a limited number of papers examining the determinants of administrative corruption. A thorough search of the relevant literature shows there has been no examination of the multivariate impact of corrupt culture, the weakness of organizational culture, the political instability, and the institutional weakness on administrative corruption, and the interplay among these constructs has yet to be studied. By testing a sample of 677 responses that reflect the perspective of the general public in Basra, Iraq, this current study attempts to fill these gaps by proposing and testing a model using the partial least squares structural equation modeling method. Overall, weak organizational culture mediates the effect of corrupt culture on corruption; institutional weakness mediates the effect of political instability on corruption; and institutional weakness mediates the effect of weak organizational culture on corruption. Finally, through theoretical contributions, managerial implications, limitations, and recommendations for further research, this study brings presents insights on how weak organizational culture and institutional weakness mediate the effect of corrupt culture on corruption.