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The Arsi are one of the largest subgroups of the Oromoo, the largest single ethnic grou inhabiting parts of Ethiopia and the Horn of Africa. The Arsi Oromoo originally were believed to be the followers of traditional indigenous religion known as Waaqeffanna but gradually at least since the eleventh-century some clans of Arsi Oromoo were in touch with Islam. In due course of time what social scientists called a syncretistic religious and cultural feature exhibiting both Oromoo and Islamic religions and cultures have start to emerge. This phenomenon was not discussed by many Ethiopian and foreign scholars. Based on the syncretic cultural approach established by U. Braukamper, this article discusses some of the major features of Islam and Waaqeffannaa and the syncretic features evolved between Oromoo and Islamic religions later among the Arsi Oromoo.