This study is about lexical use of Afaan Oromoo by journalists in the government mass media; namely,rnEthiopian Broadcasting Corporation, Oromia Radio and Television Organization, and Ethiopian PressrnAgency. The study aims at identifying, describing and characterizing the problems of lexicalrnstandardization in Afaan Oromoo as it is used in the government mass media.In the govenunent mass media journalists use the varieties of lexical items and hence the audiencesrnCalmot get the information f·ully. Taking into account standardization experiences of differentrncountries, the study recommends the development of guide (style book) so that the use of AfaanrnOromoo words in the mass media can be based on an institutionalized norm. As in the case of manyrnstandardized languages, an authoritative institution that can effectively coordinate the efforts tornstal1dardize the language is crucial. Compiling a stal1dard dictionary and other reference materia ls,rn, producing standardized educational and cultural materials are necessary steps so as to encourage thernuse of standard forms of the language. Furthermore, conducting researches on the area and thernapplication of outcomes could enhal1Ce the standard ization of the language.