Intermarriages represent a form of social connections that occur for common reasons. However, they may also occur for special reasons such as strengthening the relationship of certain families, achieving a tribal alliance, raising the social status of a family, or gaining economic benefits. This study addresses the theme of Umayyad intermarriages and tries to figure out its general nature and whether it had clear political or administrative impacts and how the sources were interested in clarifying these impacts. This research is divided into two sections: the first focused on Umayyad men and women intermarriage, both Sufiani and Marwani This study adopted two sources of pedigree books: Zubairi (d. 236 AH) Quraish Pedigree and Al-Baladhuri (d. 279 AH) Ashraf pedigree which aim to identify the general nature of Umayyad family intermarriages and the extent of social openness to other Quraish families in particular and Arab tribes in general. The researcher used the statistical method. The second section focused on searching the impacts of intermarriage on the political and administrative conditions in the Umayyad dynasty by relying on historical sources and identifying the extent to which those sources were interested in linking those situations to intermarriage.