There are several academic studies on leadership in different disciplines from past to present. Similarly, employee motivation is also a topic that has attracted attention has been studied by researchers in various disciplines. Determining the relationship between these two research topics is the main starting point of this study. In this context, this study examines the relationship between the leadership types of construction site supervisors working in the Turkish construction industry and the motivation of other employees working with them. First of all, the licensed questionnaire scale Multiple Leadership Questionnaire (MLQ), which was found to be appropriate for use as a measurement tool as a result of the literature research, was applied to the construction site supervisors and their employees bilaterally. In the study, before proceeding to data mining analysis, reliability analysis was performed in SPSS package program. After this test, data mining studies were analyzed for two different class labels on WEKA software and the association rules obtained was presented. The study concluded, original results on the "Leadership-Motivation Relationship in the Turkish Construction Industry" were obtained with data mining methods and software, which have been frequently used by researchers in different disciplines in the analysis of data masses, especially in recent years. Considering the study results, it was found that the motivation levels of employees may vary according to qualifications such as the region of work, working position, work experience, and education level. Thus, as a result of the application of which leadership type, the motivation of which work team will be "low", "medium" and "high" has been determined and original results have been put forward.