||Marie Viktorinová Abstract The data about financial support of firms and individuals to politicians provide an incentive for research as the connections between businesses and politics raises the problem of conflict of interest. Using data about results of disputes in public procurement tenders from 2004 to 2018, data about donations to political parties and data about parties in power of municipalities, regions and ministries between the years 2006 and 2018, this thesis investigates the effect of political connections on the results of disputes in public procurement. The analyze focuses on hypotheses about significant effect of having complainant or chosen contestant connected to party in power of government, municipality, region or ministry on the result of dispute being serious misconduct against fair competition, where distinct subsets of disputes with respective contracting authority are considered. Using logistic and probit regressions, the results of this thesis point out a significant positive relationship between misconduct found and chosen contestant connected to any party. Finally, the thesis lays down its constrictions and few suggestions for future research.