This study attempts to examine the moderating effect of regulation on the relationship between the success of converting conventional banks into Islamic lines and four variables: relevant experience, willingness to change, Islamic capital market, and qualified human resources. The sample for the present paper comprises data collected from 15 conventional in Libya. A multi-group analysis approach was applied to assess the moderating effect of regulation. The findings indicated that regulation significantly moderates the effect of four variables on the success of transformation. The paper contributes to the scarce knowledge about regulation and organisational transformation, with an emphasis on converting traditional banks into banks that are in line with the tenets of Shariah.