Ethiopia is the homeland and center of genetic diversity of Arabica coffee (Coffea arabica L., Rubiaceae). The entire genetic diversity of indigenous (wild) Arabica coffee is confined mainly in theXafromontane rain forest located in the west and east of Great Rift Valley. Different research findings were Xreviewed and cited on the genetic diversity and its importance to the Ethiopian coffee breeding programs forhigh productivity and disease resistance. The objective of this paper is to review on the genetic diversity of coffee (coffea arabica .L) in Ethiopia based on different marker traits (morphological and molecular markers). The evidence which indicates the existence of arabica coffee genetic diversity in Ethiopia were reviewed and cited in the body of this paper. The indicators includes genotypic and phenotypic variability, Combining ability in Arabica coffee, Existence of heterosis in coffee Arabica and the achievements made were cited as the major evidences those indicates the presence of genetic diversity in Arabica coffee in Ethiopia.